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Anthropic releases Claude API version 2026-10-21, removing temperature and top_p parameters

·2026.10.22 09:00

Key point

The update removes sampling parameters from the Messages API and returns 400 errors for documents in assistant turns and citations in user turns.

Anthropic released Claude API version 2026-10-21, its first official version release since 2023, with plans to release versions more frequently to manage breaking changes.
The Messages API no longer supports temperature, top_p, and top_k parameters.
Documents in assistant turns and citations in user turns now return a 400 error.
New major versions of the Anthropic SDKs and the ant CLI default to version 2026-10-21.
The previous version 2023-06-01 is not deprecated.
Users can update via the /claude-api skill in Claude Code or follow the migration guide at platform.claude.com.

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