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11---
22title: Claude Opus 4.6
33url: https://platform.claude.com/docs/en/models/opus-4-6/overview
4description: "Claude Opus 4.6 reference: lifecycle status, model IDs on every platform, context window, output limits, pricing, and migration resources. Claude Opus 4.6 is a legacy model; Claude Opus 5 is the current Opus model."
4description: "Claude Opus 4.6 reference: lifecycle status, model IDs on every platform, context window, output limits, pricing, and migration resources. Claude Opus 4.6 is a legacy model; Claude Opus 5.5 is the current Opus model."
55---
66
77**Legacy.** Released February 5, 2026.
88
9Although Claude Opus 4.6 is still available, you should consider migrating to Claude Opus 5 for improved performance. [See Claude Opus 5](https://platform.claude.com/docs/en/models/opus-5/overview) · [Migrate to Claude Opus 5](https://platform.claude.com/docs/en/models/opus-5/migration-guide#migrating-from-claude-opus-46)
9Although Claude Opus 4.6 is still available, you should consider migrating to Claude Opus 5.5 for improved performance. [See Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) · [Migrate to Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/migration-guide)
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1111Model ID: `claude-opus-4-6`
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1919| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
2020| :-------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :----------------------------- | :------------- | :--------------- |
2121| [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](https://platform.claude.com/docs/en/models/opus-5/overview) | 1M | 128K | $5 / $25 | Adaptive | `high` | May 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 |
2323| **Claude Opus 4.6** (this model) | 1M | 128K | $5 / $25 | Adaptive (extended deprecated) | `high` | May 2025 |
2424| [Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jan 2026 |
2525| [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, 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.
29* **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). See Pricing for the full list.
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.
29* **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.
3232* **Knowledge cutoff:** Reliable knowledge cutoff: the date through which the model’s knowledge is most extensive and reliable.
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8080## Resources
8181
8282<CardGroup cols={3}>
83 <Card title="Migrate to Claude Opus 5" icon="arrows-left-right" href="https://platform.claude.com/docs/en/models/opus-5/migration-guide#migrating-from-claude-opus-46">
84 What changes when moving from Claude Opus 4.6 and earlier Opus models to Claude Opus 5.
83 <Card title="Migrate to Claude Opus 5.5" icon="arrows-left-right" href="https://platform.claude.com/docs/en/models/opus-5-5/migration-guide#migrating-from-claude-opus-47">
84 What changes when moving from Claude Opus 4.7 and earlier Opus models to Claude Opus 5.5.
8585 </Card>
8686
87 <Card title="Claude Opus 5" icon="arrow-right" href="https://platform.claude.com/docs/en/models/opus-5/overview">
87 <Card title="Claude Opus 5.5" icon="arrow-right" href="https://platform.claude.com/docs/en/models/opus-5-5/overview">
8888 The current Opus model: overview, specs, and resources.
8989 </Card>
9090</CardGroup>