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Claude Sonnet 5
Anthropic · Sonnet
Anthropic released Claude Sonnet 5 on June 30, 2026.
Claude Sonnet 5 is the Anthropic model launched on June 30, 2026 as the next generation of its Sonnet family. It launched at introductory pricing of $2 / $10 per million input / output tokens, which became the standard price on August 10, 2026 instead of rising to $3 / $15. It supports a 1M token context window, 128k max output tokens and the same tools and platform features as Claude Sonnet 4.6, except Priority Tier. It uses a new tokenizer that produces about 30% more tokens for the same text. Computer use and browser use toolsets came to it in August 2026. Its successor is Claude Sonnet 5.5.
Claude Sonnet 5 at a glance
- Released
- API model id
claude-sonnet-5- Available on
- Claude APIGoogle Cloud
- Previous model
- Claude Sonnet 4.6 (February 17, 2026)
- Announcement
- platform.claude.com
What changed from Claude Sonnet 4.6
Three behavior changes apply when moving from Claude Sonnet 4.6: adaptive thinking is on by default, manual extended thinking (budget_tokens) is removed and returns an error, and non-default temperature, top_p or top_k values return an error.
The new tokenizer means the same prompt counts as roughly 30% more tokens, so cost comparisons should be measured on real traffic.
New to model names and version numbers? Read how AI labs version their models.
Claude Sonnet 5 release timeline
The launch and every later Anthropic release that mentions Claude Sonnet 5, oldest first.
- Claude Sonnet 5 launch
Claude Sonnet 5 launch with improvements in reasoning, tool use, coding, and knowledge work
Source: Claude Help Center Release Notes - Pricing Update for Claude Sonnet 5
Introductory pricing for Claude Sonnet 5 becomes standard price. Scheduled price increase on September 1, 2026 is canceled.
Source: Claude Platform Release Notes
Claude Sonnet 5 FAQ
When was Claude Sonnet 5 released?
Anthropic released Claude Sonnet 5 on June 30, 2026. The launch entry below links to the official announcement.
Where is Claude Sonnet 5 available?
Claude Sonnet 5 is available on Claude API and Google Cloud. Later availability changes are listed under follow-up releases on this page.
What is the Claude Sonnet 5 API model id?
Use claude-sonnet-5 in Anthropic's API.
What came before Claude Sonnet 5?
Claude Sonnet 5 follows Claude Sonnet 4.6, released on February 17, 2026.
Other Anthropic models
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