API usage primer for Claude changedclaude_api_primer
Nearest release: v2.1.300, published 2 hours after this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
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Lines−0removed
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248
where the diff opens
First seen
14 Aug 2026
this site's first read of the page
Recorded edits19to this page, all time
The whole hunk
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from line 248
248248* Claude Opus 5.5 (`claude-opus-5-5`, adaptive thinking only, always on)
249249* Claude Sonnet 5.5 (`claude-sonnet-5-5`, adaptive thinking only, on by default; `thinking: {"type": "disabled"}` returns a 400 error, so send `thinking: {"type": "between_tools"}` to turn off up-front thinking)
250250* Claude Haiku 5.5 (`claude-haiku-5-5`, adaptive thinking only, on by default)
251* Claude Fable 5.1 (`claude-fable-5-1`, adaptive thinking only, always on)
252* Claude Mythos 5.1 (`claude-mythos-5-1`, adaptive thinking only, always on)
253* Claude Fable 5 (`claude-fable-5`, adaptive thinking only, always on)
254* Claude Mythos 5 (`claude-mythos-5`, adaptive thinking only, always on)
251255* Claude Opus 5 (claude-opus-5, adaptive thinking only, on by default)
252256* Claude Sonnet 5 (`claude-sonnet-5`, adaptive thinking only, on by default)
253257* Claude Opus 4.8 (claude-opus-4-8, adaptive thinking only)
No line in this hunk matches that.