API usage primer for Claude changedclaude_api_primer
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14 Aug 2026
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Recorded edits25to this page, all time
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244244Thinking is supported in the following models:
245245
246* Claude Opus 5.5 (`claude-opus-5-5`, adaptive thinking only, always on)
246247* Claude Opus 5 (claude-opus-5, adaptive thinking only, on by default)
247248* Claude Sonnet 5 (`claude-sonnet-5`, adaptive thinking only, on by default)
248249* Claude Opus 4.8 (claude-opus-4-8, adaptive thinking only)
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