migration-guide changedmodels/sonnet-5-5/migration-guide
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486486* Expect [thinking on requests with no `thinking` field](https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide#thinking-on-by-default), and revisit `max_tokens`.
487487* Replace [thinking budgets](https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide#sonnet-46-breaking-changes) with an effort level.
488* Remove non-default `temperature`, `top_p`, and `top_k` values.
488* Remove `temperature`, `top_p`, and `top_k`.
489489* If you [show thinking text](https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide#thinking-in-responses), set `display: "summarized"`.
490490* [Recount tokens](https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide#other-changes-from-claude-sonnet-4-6), and re-budget image tokens.
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11891189 ```
11901190</CodeGroup>
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1192**Sampling parameters return an error.** Claude Sonnet 4.6 and earlier models and Claude Haiku 4.5 accept `temperature`, `top_p`, and `top_k`. On Claude Sonnet 5.5, a non-default value returns a 400 error. Remove them.
1192**Sampling parameters return an error.** Remove `temperature`, `top_p`, and `top_k`.
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11941194**Thinking text is omitted by default.** See [Handle thinking in responses](https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide#thinking-in-responses).
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