Corrected: Introducing Claude Sonnet 5.5

ClaudeNew modelConfirmed

Correction: Sonnet 5.5 handles coding and document work. Anthropic's tests report faster responses and lower cost per task than Sonnet 5. API rates are unchanged.

Anthropic releases Sonnet 5.5 for everyday tasks, coding and creating documents, slides and spreadsheets.

Anthropic reports faster responses and lower cost per task than Sonnet 5 in its tests; the underlying API rates are unchanged.

Who can use it: Claude apps and the Claude API (claude-sonnet-5-5), plus Amazon Bedrock, Claude Platform on AWS, Google Cloud and Microsoft Foundry.
When: Available from 2026-09-28.

Anthropic official announcement · Claude Platform release notes · Claude Help Center release notes Announced 2026-09-28 · date only

Read the official announcement for access details. Availability can depend on your plan, region or workplace settings.

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