API usage primer for Claude changedclaude_api_primer
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240240Thinking can sometimes help Claude with very hard tasks. The current mechanism is [adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) (`thinking: {"type": "adaptive"}`): Claude determines when and how much to think, and you steer thinking depth with the [`effort`](https://platform.claude.com/docs/en/build-with-claude/effort) parameter rather than a token budget. Adaptive thinking is supported on Claude 4.6 and later models and Claude Mythos Preview. On Claude 5 and later models and Claude Mythos Preview, thinking is on by default when the `thinking` parameter is omitted.
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242Temperature must be set to 1 (or left unset) whenever thinking is enabled, on all models. On Claude 4.7 and later models and Claude Mythos Preview, `temperature` is deprecated and only its default value is accepted, even when thinking is off.
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244242Thinking is supported in the following models:
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246244* Claude Opus 5.5 (`claude-opus-5-5`, adaptive thinking only, always on)
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