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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.221

Output effort clamped when thinking is mechanically disabled

You'll notice
Useful3 Signal0
Models

Internal helper requests no longer fail from asking for high effort with thinking off.

What

Internal one-shot model calls now mark their disabled thinking as mechanical, and a high output effort on such a request is clamped rather than sent and rejected.

Details
  • Affects web-search assistant calls, hook and classifier prompts, and structured-output helpers.
  • These requests pass thinkingConfig: { type: "disabled", mechanical: !0 }.
  • When output_config.effort would otherwise be high, it is lowered and the clamp is logged, because the API rejects higher effort with thinking disabled.
Evidence

mechanically-disabled thinking, and the API rejects higher effort when thinking is disabled (gh-79798)

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.221 →