API version 2026-10-21 removes temperature

The dates on this page apply to Anthropic-operated platforms: the Claude API, Claude Platform on AWS, Claude Models on Google Cloud (Anthropic managed), and Microsoft Foundry. Partner-operated platforms, Amazon Bedrock and Claude Models on Google Cloud (Google managed), set their

Removed in API version 2026-10-21

Returns a 400 error. Earlier API versions return it when set to a non-default value on Claude 4.7 and later models and Claude Mythos Preview.

Deprecated (Claude 4.7 and later models)

Anthropic occasionally deprecates request parameters that no longer apply to current models. A new model can reject a deprecated parameter, and a new API version can remove it for every model.