overview changedmodels/sonnet-5/overview
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## How it compares to the current lineup ## Overview ## How it compares
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11---
22title: Claude Sonnet 5
33url: https://platform.claude.com/docs/en/models/sonnet-5/overview
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."
4description: "Claude Sonnet 5 reference: lifecycle status, model IDs on every platform, context window, output limits, pricing, and migration resources. Claude Sonnet 5 is a legacy model; Claude Sonnet 5.5 is the current Sonnet model."
55---
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77**Legacy.** Released June 30, 2026.
88
9The best combination of speed and intelligence
9Although 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#migrating-from-claude-sonnet-5)
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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)
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1311Model ID: `claude-sonnet-5`
1412
1513Context window: 1M tokens · Max output: 128K tokens · Input pricing: $2 / MTok · Output pricing: $10 / MTok
1614
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)
15[Announcement](https://www.anthropic.com/news/claude-sonnet-5)
1816
19## Overview
17## How it compares to the current lineup
2018
21Claude Sonnet 5 is the next generation of Anthropic's Sonnet model family. It is a drop-in upgrade for Claude Sonnet 4.6 with three behavior changes: [adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) is on by default, manual extended thinking now returns a 400 error (it was deprecated on Claude Sonnet 4.6), and setting sampling parameters (`temperature`, `top_p`, `top_k`) to non-default values returns a 400 error. This page summarizes everything new at launch, including a new tokenizer.
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23[What's new in Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/whats-new-sonnet-5)
24
25## How it compares
26
2719| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
2820| :---------------------------------------------------------------------------------- | :------ | :--------- | :----------- | :------------------- | :------------- | :--------------- |
2921| [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 |
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8981## Good to know
9082
9183* On the [Message Batches API](https://platform.claude.com/docs/en/build-with-claude/batch-processing#extended-output-beta), Claude Sonnet 5 supports up to 300k output tokens with the `output-300k-2026-03-24` beta header.
92* Setting `temperature`, `top_p`, or `top_k` to non-default values returns a 400 error. See [What's new in Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/whats-new-sonnet-5#sampling-parameters-not-accepted).
84* Setting `temperature`, `top_p`, or `top_k` to non-default values returns a 400 error.
9385* Query limits and capabilities programmatically with the [Models API](https://platform.claude.com/docs/en/api/models/list).
9486
9587## Resources
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123115## Reference
124116
125117<CardGroup cols={3}>
118 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/claude-sonnet-5">
119 The system prompt Claude Sonnet 5 uses on claude.ai and the Claude apps.
120 </Card>
121
126122 <Card title="System card" icon="file" href="https://www.anthropic.com/claude-sonnet-5-system-card">
127123 Safety evaluations and deployment decisions for Claude Sonnet 5.
128124 </Card>
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