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API usage primer for Claude changedclaude_api_primer

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238238 
239239## Thinking
240240 
241Thinking 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 decides 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 models and Claude Mythos Preview, thinking is on by default when the `thinking` parameter is omitted.
241Thinking 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 models and Claude Mythos Preview, thinking is on by default when the `thinking` parameter is omitted.
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243243Temperature 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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253253* Claude Opus 4.6 (`claude-opus-4-6`, adaptive or legacy manual thinking)
254254* Claude Sonnet 4.6 (`claude-sonnet-4-6`, adaptive or legacy manual thinking)
255255* Claude Opus 4.5 (`claude-opus-4-5-20251101`, legacy manual thinking only)
256* Claude Sonnet 4.5 (`claude-sonnet-4-5-20250929`, legacy manual thinking only)
256* Claude Sonnet 4.5 (`claude-sonnet-4-5-20250929`, [deprecated](https://platform.claude.com/docs/en/about-claude/model-deprecations), legacy manual thinking only)
257257* Claude Haiku 4.5 (`claude-haiku-4-5-20251001`, legacy manual thinking only)
258258 
259259<Note>
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445445### Interleaved thinking
446446 
447Interleaved thinking enables Claude to think between tool calls, reasoning about tool results before deciding the next step.
447Interleaved thinking enables Claude to think between tool calls, reasoning about tool results before determining the next step.
448448 
449449<Info>
450450 On models with [adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) (`thinking: {type: "adaptive"}`), interleaved thinking is automatically enabled. No beta header is needed. Sonnet 4.6 supports both the `interleaved-thinking-2025-05-14` beta header with manual extended thinking and adaptive thinking.
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