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1616
1717## How it compares to the current lineup
1818
19| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
20| :-------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :----------------------------- | :------------- | :--------------- |
21| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
22| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
23| **Claude Opus 4.6** (this model) | 1M | 128K | $5 / $25 | Adaptive (extended deprecated) | `high` | May 2025 |
24| [Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jan 2026 |
25| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended | — | Feb 2025 |
19| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
20| :---------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :----------------------------- | :------------- | :--------------- |
21| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
22| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
23| **Claude Opus 4.6** (this model) | 1M | 128K | $5 / $25 | Adaptive (extended deprecated) | `high` | May 2025 |
24| [Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jun 2026 |
25| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended | — | Feb 2025 |
2626
2727* **Context:** 1M tokens is roughly 555k words or 2.5M Unicode characters on the current tokenizer (introduced with Claude Opus 4.7); models before it fit about 750k words in 1M tokens. 200k tokens is roughly 150k words.
28* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
28* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
2929* **Price / MTok:** Input / output, base price per million tokens. Batch API requests are 50% off; prompt caching reads cost 10% of the base input price (2.5% on Claude Fable 5.1 and Claude Mythos 5.1, 5% on Claude Opus 5.5). See Pricing for the full list.
3030* **Thinking:** Adaptive thinking lets the model decide how much to think, steered by effort. Extended thinking is the manual budget\_tokens mode on earlier models.
3131* **Default effort:** The effort parameter’s default on the Claude API. Models without a value don’t support the parameter.
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1616
1717## How it compares to the current lineup
1818
19| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
20| :-------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :------------------- | :------------- | :--------------- |
21| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
22| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
23| **Claude Opus 4.7** (this model) | 1M | 128K | $5 / $25 | Adaptive | `high` | Jan 2026 |
24| [Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jan 2026 |
25| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended | — | Feb 2025 |
19| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
20| :---------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :------------------- | :------------- | :--------------- |
21| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
22| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
23| **Claude Opus 4.7** (this model) | 1M | 128K | $5 / $25 | Adaptive | `high` | Jan 2026 |
24| [Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jun 2026 |
25| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended | — | Feb 2025 |
2626
2727* **Context:** 1M tokens is roughly 555k words or 2.5M Unicode characters on the current tokenizer (introduced with Claude Opus 4.7); models before it fit about 750k words in 1M tokens. 200k tokens is roughly 150k words.
28* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
28* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
2929* **Price / MTok:** Input / output, base price per million tokens. Batch API requests are 50% off; prompt caching reads cost 10% of the base input price (2.5% on Claude Fable 5.1 and Claude Mythos 5.1, 5% on Claude Opus 5.5). See Pricing for the full list.
3030* **Thinking:** Adaptive thinking lets the model decide how much to think, steered by effort. Extended thinking is the manual budget\_tokens mode on earlier models.
3131* **Default effort:** The effort parameter’s default on the Claude API. Models without a value don’t support the parameter.
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1414
1515## How it compares to the current lineup
1616
17| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
18| :-------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :------------------- | :------------- | :--------------- |
19| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
20| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
21| **Claude Opus 4.8** (this model) | 1M | 128K | $5 / $25 | Adaptive | `high` | Jan 2026 |
22| [Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jan 2026 |
23| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended | — | Feb 2025 |
17| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
18| :---------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :------------------- | :------------- | :--------------- |
19| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
20| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
21| **Claude Opus 4.8** (this model) | 1M | 128K | $5 / $25 | Adaptive | `high` | Jan 2026 |
22| [Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jun 2026 |
23| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended | — | Feb 2025 |
2424
2525* **Context:** 1M tokens is roughly 555k words or 2.5M Unicode characters on the current tokenizer (introduced with Claude Opus 4.7); models before it fit about 750k words in 1M tokens. 200k tokens is roughly 150k words.
26* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
26* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
2727* **Price / MTok:** Input / output, base price per million tokens. Batch API requests are 50% off; prompt caching reads cost 10% of the base input price (2.5% on Claude Fable 5.1 and Claude Mythos 5.1, 5% on Claude Opus 5.5). See Pricing for the full list.
2828* **Thinking:** Adaptive thinking lets the model decide how much to think, steered by effort. Extended thinking is the manual budget\_tokens mode on earlier models.
2929* **Default effort:** The effort parameter’s default on the Claude API. Models without a value don’t support the parameter.
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2222
2323## How it compares
2424
25| Model | Context | Max output | Price / MTok | Latency | Thinking | Default effort | Knowledge cutoff |
26| :-------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :------- | :------------------- | :------------- | :--------------- |
27| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Slower | Adaptive (always on) | `high` | Jun 2026 |
28| **Claude Opus 5.5** (this model) | 1M | 128K | $4 / $20 | Moderate | Adaptive (always on) | `medium` | Jun 2026 |
29| [Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) | 1M | 128K | $2 / $10 | Fast | Adaptive | `high` | Jan 2026 |
30| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Fastest | Extended | — | Feb 2025 |
25| Model | Context | Max output | Price / MTok | Latency | Thinking | Default effort | Knowledge cutoff |
26| :---------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :------- | :------------------- | :------------- | :--------------- |
27| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Slower | Adaptive (always on) | `high` | Jun 2026 |
28| **Claude Opus 5.5** (this model) | 1M | 128K | $4 / $20 | Moderate | Adaptive (always on) | `medium` | Jun 2026 |
29| [Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) | 1M | 128K | $2 / $10 | Fast | Adaptive | `high` | Jun 2026 |
30| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Fastest | Extended | — | Feb 2025 |
3131
3232* **Context:** 1M tokens is roughly 555k words or 2.5M Unicode characters on the current tokenizer (introduced with Claude Opus 4.7); models before it fit about 750k words in 1M tokens. 200k tokens is roughly 150k words.
33* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
33* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
3434* **Price / MTok:** Input / output, base price per million tokens. Batch API requests are 50% off; prompt caching reads cost 10% of the base input price (2.5% on Claude Fable 5.1 and Claude Mythos 5.1, 5% on Claude Opus 5.5). See Pricing for the full list.
3535* **Latency:** Comparative latency, relative to the current lineup, as published in the models overview. Actual latency depends on prompt length, output length, and thinking effort.
3636* **Thinking:** Adaptive thinking lets the model decide how much to think, steered by effort. Extended thinking is the manual budget\_tokens mode on earlier models.
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1616
1717## How it compares to the current lineup
1818
19| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
20| :-------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :------------------- | :------------- | :--------------- |
21| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
22| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
23| **Claude Opus 5** (this model) | 1M | 128K | $5 / $25 | Adaptive | `high` | May 2026 |
24| [Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jan 2026 |
25| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended | — | Feb 2025 |
19| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
20| :---------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :------------------- | :------------- | :--------------- |
21| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
22| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
23| **Claude Opus 5** (this model) | 1M | 128K | $5 / $25 | Adaptive | `high` | May 2026 |
24| [Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jun 2026 |
25| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended | — | Feb 2025 |
2626
2727* **Context:** 1M tokens is roughly 555k words or 2.5M Unicode characters on the current tokenizer (introduced with Claude Opus 4.7); models before it fit about 750k words in 1M tokens. 200k tokens is roughly 150k words.
28* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
28* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
2929* **Price / MTok:** Input / output, base price per million tokens. Batch API requests are 50% off; prompt caching reads cost 10% of the base input price (2.5% on Claude Fable 5.1 and Claude Mythos 5.1, 5% on Claude Opus 5.5). See Pricing for the full list.
3030* **Thinking:** Adaptive thinking lets the model decide how much to think, steered by effort. Extended thinking is the manual budget\_tokens mode on earlier models.
3131* **Default effort:** The effort parameter’s default on the Claude API. Models without a value don’t support the parameter.
models/overview Changed · +21 / -21 lines
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2424
2525If you're unsure which model to use, start with [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) for most workloads. Use [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) for demanding reasoning and long-horizon agentic work, or when your evals on Claude Opus 5.5 at higher effort still fall short. All current models support text and image input, text output, multilingual capabilities, vision, and tool use. Each model's page lists the platforms it's available on.
2626
27| Feature | Claude Fable 5.1 | Claude Opus 5.5 | Claude Sonnet 5 | Claude Haiku 4.5 |
28| :-------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------------------- | :------------------------------------------------------------------------------ | :------------------------------------------------------------------------------ | :-------------------------------------------------------------------------------- |
29| Description | For demanding reasoning and long-horizon agentic work | For long-running agentic coding and knowledge work | The best combination of speed and intelligence | The fastest model with near-frontier intelligence |
30| Model page | [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | [Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) | [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) |
31| Comparative latency | Slower | Moderate | Fast | Fastest |
32| [Pricing](https://platform.claude.com/docs/en/about-claude/pricing) | $10 / input MTok, $50 / output MTok | $4 / input MTok, $20 / output MTok | $2 / input MTok, $10 / output MTok | $1 / input MTok, $5 / output MTok |
33| Claude API ID | `claude-fable-5-1` | `claude-opus-5-5` | `claude-sonnet-5` | `claude-haiku-4-5-20251001` |
34| [Thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) | Adaptive (always on) | Adaptive (always on) | Adaptive | Extended |
35| [Default effort](https://platform.claude.com/docs/en/build-with-claude/effort) | `high` | `medium` | `high` | Not supported |
36| [Context window](https://platform.claude.com/docs/en/build-with-claude/context-windows) | 1M tokens | 1M tokens | 1M tokens | 200K tokens |
37| Max output | 128K tokens | 128K tokens | 128K tokens | 64K tokens |
38| Reliable knowledge cutoff | Jun 2026 | Jun 2026 | Jan 2026 | Feb 2025 |
39| Training data cutoff | Jun 2026 | Jun 2026 | Jan 2026 | Jul 2025 |
40| [Retirement](https://platform.claude.com/docs/en/about-claude/model-deprecations) | Not sooner than September 1, 2027 | Not sooner than September 22, 2027 | Not sooner than June 30, 2027 | Not sooner than October 15, 2026 |
41| Claude API alias | `claude-fable-5-1` | `claude-opus-5-5` | `claude-sonnet-5` | `claude-haiku-4-5` |
42| [Amazon Bedrock ID](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock) | `anthropic.claude-fable-5-1` | `anthropic.claude-opus-5-5` | `anthropic.claude-sonnet-5` | `anthropic.claude-haiku-4-5` |
43| [Google Cloud ID](https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai) | `claude-fable-5-1` | `claude-opus-5-5` | `claude-sonnet-5` | `claude-haiku-4-5@20251001` |
44| [Microsoft Foundry ID](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry) | `claude-fable-5-1` | `claude-opus-5-5` | `claude-sonnet-5` | `claude-haiku-4-5` |
45| [Claude Platform on AWS ID](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws) | `claude-fable-5-1` | `claude-opus-5-5` | `claude-sonnet-5` | `claude-haiku-4-5` |
27| Feature | Claude Fable 5.1 | Claude Opus 5.5 | Claude Sonnet 5.5 | Claude Haiku 4.5 |
28| :-------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------------------- | :------------------------------------------------------------------------------ | :---------------------------------------------------------------------------------- | :-------------------------------------------------------------------------------- |
29| Description | For demanding reasoning and long-horizon agentic work | For long-running agentic coding and knowledge work | The best combination of speed and intelligence | The fastest model with near-frontier intelligence |
30| Model page | [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | [Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) | [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) |
31| Comparative latency | Slower | Moderate | Fast | Fastest |
32| [Pricing](https://platform.claude.com/docs/en/about-claude/pricing) | $10 / input MTok, $50 / output MTok | $4 / input MTok, $20 / output MTok | $2 / input MTok, $10 / output MTok | $1 / input MTok, $5 / output MTok |
33| Claude API ID | `claude-fable-5-1` | `claude-opus-5-5` | `claude-sonnet-5-5` | `claude-haiku-4-5-20251001` |
34| [Thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) | Adaptive (always on) | Adaptive (always on) | Adaptive | Extended |
35| [Default effort](https://platform.claude.com/docs/en/build-with-claude/effort) | `high` | `medium` | `high` | Not supported |
36| [Context window](https://platform.claude.com/docs/en/build-with-claude/context-windows) | 1M tokens | 1M tokens | 1M tokens | 200K tokens |
37| Max output | 128K tokens | 128K tokens | 128K tokens | 64K tokens |
38| Reliable knowledge cutoff | Jun 2026 | Jun 2026 | Jun 2026 | Feb 2025 |
39| Training data cutoff | Jun 2026 | Jun 2026 | Jun 2026 | Jul 2025 |
40| [Retirement](https://platform.claude.com/docs/en/about-claude/model-deprecations) | Not sooner than September 1, 2027 | Not sooner than September 22, 2027 | Not sooner than September 28, 2027 | Not sooner than October 15, 2026 |
41| Claude API alias | `claude-fable-5-1` | `claude-opus-5-5` | `claude-sonnet-5-5` | `claude-haiku-4-5` |
42| [Amazon Bedrock ID](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock) | `anthropic.claude-fable-5-1` | `anthropic.claude-opus-5-5` | `anthropic.claude-sonnet-5-5` | `anthropic.claude-haiku-4-5` |
43| [Google Cloud ID](https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai) | `claude-fable-5-1` | `claude-opus-5-5` | `claude-sonnet-5-5` | `claude-haiku-4-5@20251001` |
44| [Microsoft Foundry ID](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry) | `claude-fable-5-1` | `claude-opus-5-5` | `claude-sonnet-5-5` | `claude-haiku-4-5` |
45| [Claude Platform on AWS ID](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws) | `claude-fable-5-1` | `claude-opus-5-5` | `claude-sonnet-5-5` | `claude-haiku-4-5` |
4646
4747* **Comparative latency:** Relative to the current lineup. Actual latency depends on prompt length, output length, and thinking effort.
4848* **Pricing:** Base price per million tokens. Batch API requests are 50% off; prompt cache reads cost 10% of the base input price (2.5% on Claude Fable 5.1 and Claude Mythos 5.1, 5% on Claude Opus 5.5). See Pricing for cache writes, long-context, and per-platform pricing.
from line 50
5050* **Thinking:** Adaptive thinking lets the model decide how much to think, steered by effort. Extended thinking is the manual thinking.type “enabled” + budget\_tokens mode on earlier models; it is deprecated on Claude Opus 4.6 and Claude Sonnet 4.6 and not accepted on later models.
5151* **Default effort:** The effort parameter’s default on the Claude API. Set effort explicitly to use a different level.
5252* **Context window:** 1M tokens is roughly 555k words or 2.5M Unicode characters on the current tokenizer (introduced with Claude Opus 4.7); models before it fit about 750k words in 1M tokens. 200k tokens is roughly 150k words.
53* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
53* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
5454* **Reliable knowledge cutoff:** The date through which the model’s knowledge is most extensive and reliable. Training data cutoff (under Additional details) is the broader range of data used. See Anthropic’s Transparency Hub for details.
5555* **Retirement:** Anthropic’s commitment for Anthropic-operated platforms (Claude API, Claude Platform on AWS, Microsoft Foundry). Amazon Bedrock and Google Cloud set their own dates.
5656* **Claude API alias:** For models before the 4.6 generation, the alias is a convenience pointer that resolves to the dated ID. Dateless IDs are their own pinned snapshot; the alias row repeats them.
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6161
6262See [Model IDs and versioning](https://platform.claude.com/docs/en/about-claude/models/model-ids-and-versions) and [Pricing](https://platform.claude.com/docs/en/about-claude/pricing).
6363
64Legacy models (still available): [Claude Fable 5](https://platform.claude.com/docs/en/models/fable-5/overview), [Claude Opus 5](https://platform.claude.com/docs/en/models/opus-5/overview), [Claude Opus 4.8](https://platform.claude.com/docs/en/models/opus-4-8/overview), [Claude Opus 4.7](https://platform.claude.com/docs/en/models/opus-4-7/overview), [Claude Opus 4.6](https://platform.claude.com/docs/en/models/opus-4-6/overview), [Claude Opus 4.5](https://platform.claude.com/docs/en/models/opus-4-5/overview), [Claude Sonnet 4.6](https://platform.claude.com/docs/en/models/sonnet-4-6/overview), [Claude Sonnet 4.5](https://platform.claude.com/docs/en/models/sonnet-4-5/overview).
64Legacy models (still available): [Claude Fable 5](https://platform.claude.com/docs/en/models/fable-5/overview), [Claude Opus 5](https://platform.claude.com/docs/en/models/opus-5/overview), [Claude Opus 4.8](https://platform.claude.com/docs/en/models/opus-4-8/overview), [Claude Opus 4.7](https://platform.claude.com/docs/en/models/opus-4-7/overview), [Claude Opus 4.6](https://platform.claude.com/docs/en/models/opus-4-6/overview), [Claude Opus 4.5](https://platform.claude.com/docs/en/models/opus-4-5/overview), [Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview), [Claude Sonnet 4.6](https://platform.claude.com/docs/en/models/sonnet-4-6/overview), [Claude Sonnet 4.5](https://platform.claude.com/docs/en/models/sonnet-4-5/overview).
6565
6666Once you've picked a model, [learn how to make your first API call](https://platform.claude.com/docs/en/get-started). To understand how model IDs, aliases, and snapshots work, see [Model IDs and versioning](https://platform.claude.com/docs/en/about-claude/models/model-ids-and-versions); for the reliable-knowledge and training-data cutoffs behind each model, see [Anthropic's Transparency Hub](https://www.anthropic.com/transparency).
6767
models/sonnet-4-5/overview Changed · +13 / -13 lines
from line 1
11---
22title: Claude Sonnet 4.5
33url: https://platform.claude.com/docs/en/models/sonnet-4-5/overview
4description: "Claude Sonnet 4.5 reference: lifecycle status, model IDs on every platform, context window, output limits, pricing, and migration resources. Claude Sonnet 4.5 is a legacy model; Claude Sonnet 5 is the current Sonnet model."
4description: "Claude Sonnet 4.5 reference: lifecycle status, model IDs on every platform, context window, output limits, pricing, and migration resources. Claude Sonnet 4.5 is a legacy model; Claude Sonnet 5.5 is the current Sonnet model."
55---
66
77**Legacy.** Released September 29, 2025.
88
9Although Claude Sonnet 4.5 is still available, you should consider migrating to Claude Sonnet 5 for improved performance. [See Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) · [Migrate to Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/migration-guide#migrating-from-sonnet-45)
9Although Claude Sonnet 4.5 is still available, you should consider migrating to Claude Sonnet 5.5 for improved performance. [See Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) · [Migrate to Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide)
1010
1111Model ID: `claude-sonnet-4-5-20250929`
1212
from line 16
1616
1717## How it compares to the current lineup
1818
19| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
20| :-------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :------------------- | :------------- | :--------------- |
21| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
22| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
23| [Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jan 2026 |
24| **Claude Sonnet 4.5** (this model) | 200K | 64K | $3 / $15 | Extended | — | Jan 2025 |
25| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended | — | Feb 2025 |
19| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
20| :---------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :------------------- | :------------- | :--------------- |
21| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
22| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
23| [Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jun 2026 |
24| **Claude Sonnet 4.5** (this model) | 200K | 64K | $3 / $15 | Extended | — | Jan 2025 |
25| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended | — | Feb 2025 |
2626
2727* **Context:** 1M tokens is roughly 555k words or 2.5M Unicode characters on the current tokenizer (introduced with Claude Opus 4.7); models before it fit about 750k words in 1M tokens. 200k tokens is roughly 150k words.
28* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
28* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
2929* **Price / MTok:** Input / output, base price per million tokens. Batch API requests are 50% off; prompt caching reads cost 10% of the base input price (2.5% on Claude Fable 5.1 and Claude Mythos 5.1, 5% on Claude Opus 5.5). See Pricing for the full list.
3030* **Thinking:** Adaptive thinking lets the model decide how much to think, steered by effort. Extended thinking is the manual budget\_tokens mode on earlier models.
3131* **Default effort:** The effort parameter’s default on the Claude API. Models without a value don’t support the parameter.
from line 81
8181## Resources
8282
8383<CardGroup cols={3}>
84 <Card title="Migrate to Claude Sonnet 5" icon="arrows-left-right" href="https://platform.claude.com/docs/en/models/sonnet-5/migration-guide#migrating-from-sonnet-45">
85 What changes when moving from Claude Sonnet 4.5 and earlier Sonnet models to Claude Sonnet 5.
84 <Card title="Migrate to Claude Sonnet 5.5" icon="arrows-left-right" href="https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide#migrating-from-claude-sonnet-4-6">
85 What changes when moving from Claude Sonnet 4.5 and earlier Sonnet models to Claude Sonnet 5.5.
8686 </Card>
8787
88 <Card title="Claude Sonnet 5" icon="arrow-right" href="https://platform.claude.com/docs/en/models/sonnet-5/overview">
88 <Card title="Claude Sonnet 5.5" icon="arrow-right" href="https://platform.claude.com/docs/en/models/sonnet-5-5/overview">
8989 The current Sonnet model: overview, specs, and resources.
9090 </Card>
9191</CardGroup>
models/sonnet-4-6/overview Changed · +13 / -13 lines
from line 1
11---
22title: Claude Sonnet 4.6
33url: https://platform.claude.com/docs/en/models/sonnet-4-6/overview
4description: "Claude Sonnet 4.6 reference: lifecycle status, model IDs on every platform, context window, output limits, pricing, and migration resources. Claude Sonnet 4.6 is a legacy model; Claude Sonnet 5 is the current Sonnet model."
4description: "Claude Sonnet 4.6 reference: lifecycle status, model IDs on every platform, context window, output limits, pricing, and migration resources. Claude Sonnet 4.6 is a legacy model; Claude Sonnet 5.5 is the current Sonnet model."
55---
66
77**Legacy.** Released February 17, 2026.
88
9Although Claude Sonnet 4.6 is still available, you should consider migrating to Claude Sonnet 5 for improved performance. [See Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) · [Migrate to Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/migration-guide#migrating-from-claude-sonnet-4-6-to-claude-sonnet-5)
9Although Claude Sonnet 4.6 is still available, you should consider migrating to Claude Sonnet 5.5 for improved performance. [See Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) · [Migrate to Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide)
1010
1111Model ID: `claude-sonnet-4-6`
1212
from line 16
1616
1717## How it compares to the current lineup
1818
19| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
20| :-------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :----------------------------- | :------------- | :--------------- |
21| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
22| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
23| [Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jan 2026 |
24| **Claude Sonnet 4.6** (this model) | 1M | 128K | $3 / $15 | Adaptive (extended deprecated) | `high` | Aug 2025 |
25| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended | — | Feb 2025 |
19| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
20| :---------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :----------------------------- | :------------- | :--------------- |
21| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
22| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
23| [Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jun 2026 |
24| **Claude Sonnet 4.6** (this model) | 1M | 128K | $3 / $15 | Adaptive (extended deprecated) | `high` | Aug 2025 |
25| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended | — | Feb 2025 |
2626
2727* **Context:** 1M tokens is roughly 555k words or 2.5M Unicode characters on the current tokenizer (introduced with Claude Opus 4.7); models before it fit about 750k words in 1M tokens. 200k tokens is roughly 150k words.
28* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
28* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
2929* **Price / MTok:** Input / output, base price per million tokens. Batch API requests are 50% off; prompt caching reads cost 10% of the base input price (2.5% on Claude Fable 5.1 and Claude Mythos 5.1, 5% on Claude Opus 5.5). See Pricing for the full list.
3030* **Thinking:** Adaptive thinking lets the model decide how much to think, steered by effort. Extended thinking is the manual budget\_tokens mode on earlier models.
3131* **Default effort:** The effort parameter’s default on the Claude API. Models without a value don’t support the parameter.
from line 81
8181## Resources
8282
8383<CardGroup cols={3}>
84 <Card title="Migrate to Claude Sonnet 5" icon="arrows-left-right" href="https://platform.claude.com/docs/en/models/sonnet-5/migration-guide#migrating-from-claude-sonnet-4-6-to-claude-sonnet-5">
85 What changes when moving from Claude Sonnet 4.6 to Claude Sonnet 5.
84 <Card title="Migrate to Claude Sonnet 5.5" icon="arrows-left-right" href="https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide#migrating-from-claude-sonnet-4-6">
85 What changes when moving from Claude Sonnet 4.6 to Claude Sonnet 5.5.
8686 </Card>
8787
88 <Card title="Claude Sonnet 5" icon="arrow-right" href="https://platform.claude.com/docs/en/models/sonnet-5/overview">
88 <Card title="Claude Sonnet 5.5" icon="arrow-right" href="https://platform.claude.com/docs/en/models/sonnet-5-5/overview">
8989 The current Sonnet model: overview, specs, and resources.
9090 </Card>
9191</CardGroup>
models/sonnet-5/overview Changed · +22 / -13 lines
from line 1
11---
22title: Claude Sonnet 5
33url: https://platform.claude.com/docs/en/models/sonnet-5/overview
4description: "Claude Sonnet 5 at a glance: what it's for, model IDs on every platform, context window, output limits, pricing, availability, and the guides and resources for building with it."
4description: "Claude Sonnet 5 reference: lifecycle status, model IDs on every platform, context window, output limits, pricing, and migration resources. Claude Sonnet 5.5 is the current Sonnet model."
55---
66
7**Latest.** Released June 30, 2026.
7**Legacy.** Released June 30, 2026.
88
99The best combination of speed and intelligence
1010
11Although Claude Sonnet 5 is still available, you should consider migrating to Claude Sonnet 5.5 for improved performance. [See Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) · [Migrate to Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide)
12
1113Model ID: `claude-sonnet-5`
1214
1315Context window: 1M tokens · Max output: 128K tokens · Input pricing: $2 / MTok · Output pricing: $10 / MTok
1416
15[Announcement](https://www.anthropic.com/news/claude-sonnet-5) · [What’s new](https://platform.claude.com/docs/en/models/sonnet-5/whats-new-sonnet-5) · [Migration guide](https://platform.claude.com/docs/en/models/sonnet-5/migration-guide)
17[Announcement](https://www.anthropic.com/news/claude-sonnet-5) · [What’s new](https://platform.claude.com/docs/en/models/sonnet-5/whats-new-sonnet-5)
1618
1719## Overview
1820
from line 24
2224
2325## How it compares
2426
25| Model | Context | Max output | Price / MTok | Latency | Thinking | Default effort | Knowledge cutoff |
26| :-------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :------- | :------------------- | :------------- | :--------------- |
27| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Slower | Adaptive (always on) | `high` | Jun 2026 |
28| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Moderate | Adaptive (always on) | `medium` | Jun 2026 |
29| **Claude Sonnet 5** (this model) | 1M | 128K | $2 / $10 | Fast | Adaptive | `high` | Jan 2026 |
30| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Fastest | Extended | — | Feb 2025 |
27| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
28| :---------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :------------------- | :------------- | :--------------- |
29| [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
30| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
31| [Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jun 2026 |
32| **Claude Sonnet 5** (this model) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jan 2026 |
33| [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) | 200K | 64K | $1 / $5 | Extended | — | Feb 2025 |
3134
3235* **Context:** 1M tokens is roughly 555k words or 2.5M Unicode characters on the current tokenizer (introduced with Claude Opus 4.7); models before it fit about 750k words in 1M tokens. 200k tokens is roughly 150k words.
33* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
36* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
3437* **Price / MTok:** Input / output, base price per million tokens. Batch API requests are 50% off; prompt caching reads cost 10% of the base input price (2.5% on Claude Fable 5.1 and Claude Mythos 5.1, 5% on Claude Opus 5.5). See Pricing for the full list.
35* **Latency:** Comparative latency, relative to the current lineup, as published in the models overview. Actual latency depends on prompt length, output length, and thinking effort.
3638* **Thinking:** Adaptive thinking lets the model decide how much to think, steered by effort. Extended thinking is the manual budget\_tokens mode on earlier models.
3739* **Default effort:** The effort parameter’s default on the Claude API. Models without a value don’t support the parameter.
3840* **Knowledge cutoff:** Reliable knowledge cutoff: the date through which the model’s knowledge is most extensive and reliable.
from line 73
7173| [Max output (Batch API, beta)](https://platform.claude.com/docs/en/build-with-claude/batch-processing#extended-output-beta) | 300K tokens |
7274| [Thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) | Adaptive |
7375| [Default effort](https://platform.claude.com/docs/en/build-with-claude/effort) | `high` |
74| Comparative latency | Fast |
7576| Input → output | Text and images → text |
7677| Reliable knowledge cutoff | Jan 2026 |
7778| Training data cutoff | Jan 2026 |
from line 81
8081
8182| Feature | Value |
8283| :---------------------------------------------------------------------------- | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
83| [Status](https://platform.claude.com/docs/en/about-claude/model-deprecations) | Active (latest) |
84| [Status](https://platform.claude.com/docs/en/about-claude/model-deprecations) | Active (legacy) |
8485| Released | June 30, 2026 |
8586| Retirement | Not sooner than June 30, 2027 |
8687| Platforms | Claude API, [Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock), [Google Cloud](https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai), [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry), [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws) |
from line 95
9495## Resources
9596
9697<CardGroup cols={3}>
98 <Card title="Migrate to Claude Sonnet 5.5" icon="arrows-left-right" href="https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide#migrating-from-claude-sonnet-5">
99 What changes when moving from Claude Sonnet 5 to Claude Sonnet 5.5.
100 </Card>
101
102 <Card title="Claude Sonnet 5.5" icon="arrow-right" href="https://platform.claude.com/docs/en/models/sonnet-5-5/overview">
103 The current Sonnet model: overview, specs, and resources.
104 </Card>
105
97106 <Card title="Prompting Claude Sonnet 5" icon="lightbulb" href="https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/prompting-claude-sonnet-5">
98107 Model-specific prompting guidance.
99108 </Card>
release-notes/overview Changed · +6 / -0 lines
### September 28, 2026
from line 12
1212 For updates to Claude Code, see the [complete CHANGELOG.md](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md) in the `claude-code` repository.
1313</Tip>
1414
15### September 28, 2026
16
17* We've launched **Claude Sonnet 5.5** (`claude-sonnet-5-5`). It's available on the Claude API, [Claude in Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock), [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws), [Claude on Google Cloud](https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai), and [Claude in Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry). For its context window, output limits, and prices, see the [Claude Sonnet 5.5 model page](https://platform.claude.com/docs/en/models/sonnet-5-5/overview).
18* Code written for Claude Sonnet 5 can break on Claude Sonnet 5.5 in five ways. To turn off up-front thinking, send `thinking: {"type": "between_tools"}` instead of `"disabled"`, at `high` effort or below. Forced tool use (`tool_choice` types `any` and `tool`) returns a 400 error. Thinking blocks are tied to the model and the conversation. On the Claude API and Google Cloud, the earlier `computer_20251124` computer use tool isn't accepted. The advisor tool rejects Claude Opus 4.8, Claude Opus 4.7, and Claude Sonnet 5 as advisors. See [What's new in Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/whats-new-sonnet-5-5) for each change and the [migration guide](https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide) for before-and-after requests. For model-specific prompting patterns, see [Prompting Claude Sonnet 5.5](https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/prompting-claude-sonnet-5-5).
19* Thinking blocks that Claude Sonnet 5.5 produces work only in the account that produced them, or in an account linked to it. When another account sends one of these blocks, the API drops the block before the model sees it, and the request succeeds. Blocks from earlier models aren't affected. See [Preserved thinking](https://platform.claude.com/docs/en/build-with-claude/preserved-thinking#account-bound-thinking).
20
1521### September 24, 2026
1622
1723* We're resuming billing for refusals that arrive before any output when `stop_details.category` is `"bio"`, `"frontier_llm"`, or `"reasoning_extraction"`, the categories where we measure low volumes of false positives. Mid-stream refusals were already billed. Refusals billed under this change are charged like any other request, at the rates of the model that ran it. Refusals before any output in other categories are still not billed, and fallback credit is unchanged. This change applies on all platforms. See [How refusals are billed](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#how-refusals-are-billed).
about-claude/model-deprecations Changed · +1 / -0 lines
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8181| claude-opus-4-5-20251101 | Active | N/A | Not sooner than November 24, 2026 |
8282| claude-opus-4-1-20250805 | Retired | June 5, 2026 | August 5, 2026 |
8383| claude-opus-4-20250514 | Retired | April 14, 2026 | June 15, 2026 |
84| claude-sonnet-5-5 | Active | N/A | Not sooner than September 28, 2027 |
8485| claude-sonnet-5 | Active | N/A | Not sooner than June 30, 2027 |
8586| claude-sonnet-4-6 | Active | N/A | Not sooner than February 17, 2027 |
8687| claude-sonnet-4-5-20250929 | Active | N/A | Not sooner than September 29, 2026 |
about-claude/pricing Changed · +3 / -0 lines
from line 26
2626| Claude Opus 4.5 | $5 / MTok | $6.25 / MTok | $10 / MTok | $0.50 / MTok | $25 / MTok |
2727| Claude Opus 4.1 ([retired, except on Bedrock and Google Cloud](https://platform.claude.com/docs/en/about-claude/model-deprecations)) | $15 / MTok | $18.75 / MTok | $30 / MTok | $1.50 / MTok | $75 / MTok |
2828| Claude Opus 4 ([retired, except on Google Cloud](https://platform.claude.com/docs/en/about-claude/model-deprecations)) | $15 / MTok | $18.75 / MTok | $30 / MTok | $1.50 / MTok | $75 / MTok |
29| Claude Sonnet 5.5 | $2 / MTok | $2.50 / MTok | $4 / MTok | $0.20 / MTok | $10 / MTok |
2930| Claude Sonnet 5 | $2 / MTok<sup>3</sup> | $2.50 / MTok | $4 / MTok | $0.20 / MTok | $10 / MTok<sup>3</sup> |
3031| Claude Sonnet 4.6 | $3 / MTok | $3.75 / MTok | $6 / MTok | $0.30 / MTok | $15 / MTok |
3132| Claude Sonnet 4.5 | $3 / MTok | $3.75 / MTok | $6 / MTok | $0.30 / MTok | $15 / MTok |
from line 199
198199| Claude Opus 4.5 | $2.50 / MTok | $12.50 / MTok |
199200| Claude Opus 4.1 ([retired, except on Bedrock and Google Cloud](https://platform.claude.com/docs/en/about-claude/model-deprecations)) | $7.50 / MTok | $37.50 / MTok |
200201| Claude Opus 4 ([retired, except on Google Cloud](https://platform.claude.com/docs/en/about-claude/model-deprecations)) | $7.50 / MTok | $37.50 / MTok |
202| Claude Sonnet 5.5 | $1 / MTok | $5 / MTok |
201203| Claude Sonnet 5 | $1 / MTok | $5 / MTok |
202204| Claude Sonnet 4.6 | $1.50 / MTok | $7.50 / MTok |
203205| Claude Sonnet 4.5 | $1.50 / MTok | $7.50 / MTok |
from line 245
243245| Claude Opus 4.5 | 496 tokens | 588 tokens |
244246| Claude Opus 4.1 ([retired, except on Bedrock and Google Cloud](https://platform.claude.com/docs/en/about-claude/model-deprecations)) | 313 tokens | 315 tokens |
245247| Claude Opus 4 ([retired, except on Google Cloud](https://platform.claude.com/docs/en/about-claude/model-deprecations)) | 313 tokens | 315 tokens |
248| Claude Sonnet 5.5 | 286 tokens | |
246249| Claude Sonnet 5 | 354 tokens | 474 tokens |
247250| Claude Sonnet 4.6 | 497 tokens | 589 tokens |
248251| Claude Sonnet 4.5 | 496 tokens | 588 tokens |
agents-and-tools/tool-use/browser-use-tool Changed · +1 / -0 lines
from line 14
1414 - claude-mythos-5
1515 - claude-opus-5-5
1616 - claude-opus-5
17 - claude-sonnet-5-5
1718 - claude-sonnet-5
1819 - claude-opus-4-8
1920 supportedPlatforms:
agents-and-tools/tool-use/code-execution-tool Changed · +1 / -0 lines
from line 16
1616 - claude-opus-4-7
1717 - claude-opus-4-6
1818 - claude-opus-4-5-20251101
19 - claude-sonnet-5-5
1920 - claude-sonnet-5
2021 - claude-sonnet-4-6
2122 - claude-sonnet-4-5-20250929
agents-and-tools/tool-use/define-tools Changed · +1 / -1 lines
from line 559
559559| Model or setting | Restriction | What to use instead |
560560| ----------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
561561| Manual [extended thinking](https://platform.claude.com/docs/en/build-with-claude/extended-thinking) (`thinking: {type: "enabled"}`) | `any` and `tool` are not supported and result in an error | `auto` or `none`. [Adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) itself doesn't block forced tool use (Claude Opus 5 supports it with thinking on); the models in the next row reject forced tool use regardless of thinking settings |
562| Claude Opus 5.5, Claude Fable 5.1, and [Claude Mythos 5.1](https://anthropic.com/glasswing) | `any` and `tool` return a [400 error](https://platform.claude.com/docs/en/api/errors#forced-tool-use-not-supported) | `auto` with [strict tool use](https://platform.claude.com/docs/en/agents-and-tools/tool-use/strict-tool-use) to guarantee schema-valid tool inputs, or [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs) when you need a response in a fixed JSON shape. Prompting still influences which tool `auto` picks. `none` is also supported |
562| Claude Opus 5.5, Claude Sonnet 5.5, Claude Fable 5.1, and [Claude Mythos 5.1](https://anthropic.com/glasswing) | `any` and `tool` return a [400 error](https://platform.claude.com/docs/en/api/errors#forced-tool-use-not-supported) | `auto` with [strict tool use](https://platform.claude.com/docs/en/agents-and-tools/tool-use/strict-tool-use) to guarantee schema-valid tool inputs, or [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs) when you need a response in a fixed JSON shape. Prompting still influences which tool `auto` picks. `none` is also supported |
563563
564564On models that support it, the highlighted lines are the only difference from a standard tool use request:
565565
agents-and-tools/tool-use/overview Changed · +1 / -0 lines
from line 874
874874| Claude Opus 4.5 | 496 tokens | 588 tokens |
875875| Claude Opus 4.1 ([retired, except on Bedrock and Google Cloud](https://platform.claude.com/docs/en/about-claude/model-deprecations)) | 313 tokens | 315 tokens |
876876| Claude Opus 4 ([retired, except on Google Cloud](https://platform.claude.com/docs/en/about-claude/model-deprecations)) | 313 tokens | 315 tokens |
877| Claude Sonnet 5.5 | 286 tokens | |
877878| Claude Sonnet 5 | 354 tokens | 474 tokens |
878879| Claude Sonnet 4.6 | 497 tokens | 589 tokens |
879880| Claude Sonnet 4.5 | 496 tokens | 588 tokens |
agents-and-tools/tool-use/parallel-tool-use Changed · +1 / -1 lines
from line 1131
11311131
11321132### Exactly one tool call
11331133
1134When `tool_choice` type is `any` or `tool`, setting `disable_parallel_tool_use: true` means Claude calls exactly one tool. Claude Opus 5.5, Claude Fable 5.1, and Claude Mythos 5.1 don't support these `tool_choice` types (see [Forcing tool use](https://platform.claude.com/docs/en/agents-and-tools/tool-use/define-tools#forcing-tool-use)). The following example uses `any`. The same field works with `tool`:
1134When `tool_choice` type is `any` or `tool`, setting `disable_parallel_tool_use: true` means Claude calls exactly one tool. Claude Opus 5.5, Claude Sonnet 5.5, Claude Fable 5.1, and Claude Mythos 5.1 don't support these `tool_choice` types (see [Forcing tool use](https://platform.claude.com/docs/en/agents-and-tools/tool-use/define-tools#forcing-tool-use)). The following example uses `any`. The same field works with `tool`:
11351135
11361136<CodeGroup>
11371137 ```bash cURL
agents-and-tools/tool-use/programmatic-tool-calling Changed · +1 / -0 lines
from line 16
1616 - claude-opus-4-7
1717 - claude-opus-4-6
1818 - claude-opus-4-5-20251101
19 - claude-sonnet-5-5
1920 - claude-sonnet-5
2021 - claude-sonnet-4-6
2122 - claude-sonnet-4-5-20250929
agents-and-tools/tool-use/tool-search-tool Changed · +1 / -0 lines
from line 47
4747| Claude Mythos 5 (claude-mythos-5) | `tool_search_tool_regex_20251119`, `tool_search_tool_bm25_20251119` |
4848| Claude Opus 5.5 (claude-opus-5-5) | `tool_search_tool_regex_20251119`, `tool_search_tool_bm25_20251119` |
4949| Claude Opus 5 (claude-opus-5) | `tool_search_tool_regex_20251119`, `tool_search_tool_bm25_20251119` |
50| Claude Sonnet 5.5 (claude-sonnet-5-5) | `tool_search_tool_regex_20251119`, `tool_search_tool_bm25_20251119` |
5051| Claude Opus 4.8 (claude-opus-4-8) | `tool_search_tool_regex_20251119`, `tool_search_tool_bm25_20251119` |
5152| Claude Opus 4.7 (claude-opus-4-7) | `tool_search_tool_regex_20251119`, `tool_search_tool_bm25_20251119` |
5253| Claude Opus 4.6 (claude-opus-4-6) | `tool_search_tool_regex_20251119`, `tool_search_tool_bm25_20251119` |
api/service-tiers Changed · +1 / -1 lines
from line 227
227227
228228### Supported models
229229
230Priority Tier is supported on all available Claude models except Claude Fable 5.1, Claude Mythos 5.1, Claude Mythos 5, [Claude Mythos Preview](https://anthropic.com/glasswing), Claude Opus 5.5, Claude Opus 5, and Claude Sonnet 5.
230Priority Tier is supported on all available Claude models except Claude Fable 5.1, Claude Mythos 5.1, Claude Mythos 5, [Claude Mythos Preview](https://anthropic.com/glasswing), Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, and Claude Sonnet 5.
231231
232232Check the [Models overview](https://platform.claude.com/docs/en/models/overview) for more details on available models.
233233
build-with-claude/batch-processing Changed · +2 / -1 lines
from line 95
9595| Claude Opus 4.5 | $2.50 / MTok | $12.50 / MTok |
9696| Claude Opus 4.1 ([retired, except on Bedrock and Google Cloud](https://platform.claude.com/docs/en/about-claude/model-deprecations)) | $7.50 / MTok | $37.50 / MTok |
9797| Claude Opus 4 ([retired, except on Google Cloud](https://platform.claude.com/docs/en/about-claude/model-deprecations)) | $7.50 / MTok | $37.50 / MTok |
98| Claude Sonnet 5.5 | $1 / MTok | $5 / MTok |
9899| Claude Sonnet 5 | $1 / MTok | $5 / MTok |
99100| Claude Sonnet 4.6 | $1.50 / MTok | $7.50 / MTok |
100101| Claude Sonnet 4.5 | $1.50 / MTok | $7.50 / MTok |
from line 1570
15691570
15701571### Extended output (beta)
15711572
1572The `output-300k-2026-03-24` beta header raises the `max_tokens` cap to 300,000 for batch requests using Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5, or Claude Sonnet 4.6. Include the header to generate outputs far longer than the standard 128k `max_tokens` limit in a single turn.
1573The `output-300k-2026-03-24` beta header raises the `max_tokens` cap to 300,000 for batch requests using Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5.5, Claude Sonnet 5, or Claude Sonnet 4.6. Include the header to generate outputs far longer than the standard 128k `max_tokens` limit in a single turn.
15731574
15741575<Note>
15751576 Extended output is available on the Message Batches API only, not the synchronous Messages API. It is supported on the Claude API and Claude Platform on AWS, and is not currently available on Amazon Bedrock, Google Cloud, or Microsoft Foundry.
build-with-claude/claude-in-amazon-bedrock Changed · +2 / -1 lines
from line 343
343343| Claude Opus 5 | `anthropic.claude-opus-5` | [See Access](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock#access) |
344344| Claude Opus 4.8 | `anthropic.claude-opus-4-8` | Open |
345345| Claude Opus 4.7 | `anthropic.claude-opus-4-7` | Open |
346| Claude Sonnet 5.5 | `anthropic.claude-sonnet-5-5` | [See Access](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock#access) |
346347| Claude Sonnet 5 | `anthropic.claude-sonnet-5` | Open |
347348| Claude Haiku 4.5 | `anthropic.claude-haiku-4-5` | Open |
348349
from line 383
382383* **Global:** dynamic routing across all available regions for maximum availability. No pricing premium.
383384* **Regional:** the endpoint resolves to the single AWS region you specify, for data-residency requirements. Regional endpoints carry a 10% pricing premium over global endpoints. To route across multiple regions within a geography, use an [inference profile](https://docs.aws.amazon.com/bedrock/latest/userguide/cross-region-inference.html) (US, EU, JP, or AU). Regions marked **In-region only** in the table support direct single-region routing without an inference profile.
384385
385The global endpoint is available for Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Sonnet 5, and Claude Haiku 4.5. For Claude Fable 5.1, regional endpoints are currently available in `us-east-1` only. Claude Mythos Preview is regional only and is available in `us-east-1`.
386The global endpoint is available for Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Sonnet 5.5, Claude Sonnet 5, and Claude Haiku 4.5. For Claude Fable 5.1, regional endpoints are currently available in `us-east-1` only. Claude Mythos Preview is regional only and is available in `us-east-1`.
386387
387388| AWS region | Location | Endpoint types |
388389| ---------------- | ------------------------- | -------------------------- |
build-with-claude/claude-on-vertex-ai Changed · +2 / -1 lines
from line 129
129129| Claude Opus 4.5 | `claude-opus-4-5@20251101` |
130130| Claude Opus 4.1 ([deprecated](https://platform.claude.com/docs/en/about-claude/model-deprecations)) | `claude-opus-4-1@20250805` |
131131| Claude Opus 4 ([deprecated](https://platform.claude.com/docs/en/about-claude/model-deprecations)) | `claude-opus-4@20250514` |
132| Claude Sonnet 5.5 | `claude-sonnet-5-5` |
132133| Claude Sonnet 5 | `claude-sonnet-5` |
133134| Claude Sonnet 4.6 | `claude-sonnet-4-6` |
134135| Claude Sonnet 4.5 | `claude-sonnet-4-5@20250929` |
from line 369
368369
369370### Context window
370371
371Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5, and Claude Sonnet 4.6 have a [1M-token context window](https://platform.claude.com/docs/en/build-with-claude/context-windows) on Agent Platform. Other Claude models, including Sonnet 4.5 and Sonnet 4 (deprecated), have a 200k-token context window.
372Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5.5, Claude Sonnet 5, and Claude Sonnet 4.6 have a [1M-token context window](https://platform.claude.com/docs/en/build-with-claude/context-windows) on Agent Platform. Other Claude models, including Sonnet 4.5 and Sonnet 4 (deprecated), have a 200k-token context window.
372373
373374Agent Platform limits request payloads to 30 MB. When sending large documents or many images, you might reach this limit before the token limit.
374375
build-with-claude/claude-platform-on-aws Changed · +1 / -0 lines
from line 354
354354| Claude Opus 4.7 | `claude-opus-4-7` |
355355| Claude Opus 4.6 | `claude-opus-4-6` |
356356| Claude Opus 4.5 | `claude-opus-4-5` |
357| Claude Sonnet 5.5 | `claude-sonnet-5-5` |
357358| Claude Sonnet 5 | `claude-sonnet-5` |
358359| Claude Sonnet 4.6 | `claude-sonnet-4-6` |
359360| Claude Sonnet 4.5 | `claude-sonnet-4-5` |
build-with-claude/compaction-background Changed · +1 / -0 lines
from line 16
1616 - claude-opus-4-8
1717 - claude-opus-4-7
1818 - claude-opus-4-6
19 - claude-sonnet-5-5
1920 - claude-sonnet-5
2021 - claude-sonnet-4-6
2122 supportedPlatforms: