working-with-messages changedbuild-with-claude/working-with-messages
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2020## Basic request and response
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2222<Note>
23 The `temperature`, `top_p`, and `top_k` sampling parameters are not supported on Claude 4.7 and later models and Claude Mythos Preview. Setting them to a non-default value returns a 400 error. Omit them from request payloads and use prompting to guide the model's behavior instead. See the [migration guide](https://platform.claude.com/docs/en/models/opus-5-5/migration-guide#opus-46-breaking-changes).
23 The `temperature`, `top_p`, and `top_k` sampling parameters are not supported on Claude 4.7 and later models and Claude Mythos Preview, or on any model starting with [API version `2026-10-21`](https://platform.claude.com/docs/en/api/migration-2026-10-21#sampling-parameters). Setting them to a non-default value returns a 400 error, and starting with `2026-10-21` any value does. Omit them from request payloads and use prompting to guide the model's behavior instead. See the [migration guide](https://platform.claude.com/docs/en/models/opus-5-5/migration-guide#opus-46-breaking-changes).
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