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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 v2.1.219

Bundled SDK reference docs updated for the new Opus

You'll notice
Useful2 Signal0
Elsewhere

Bundled Java and PHP API docs now describe thinking defaults and a new XHIGH effort level.

What

The Java and PHP API reference documents shipped inside the binary describe thinking behaviour for the new Opus model.

Details
  • thinking is on by default for the new Opus, and omitting it runs adaptive, unlike Opus 4.8 and 4.7
  • ThinkingConfigDisabled (Java) and ['type' => 'disabled'] (PHP) are accepted only at effort high or lower; XHIGH and MAX return 400
  • XHIGH added to the listed effort enum values
  • the basic Java example switches to the .model(String) overload, and the refusal-fallback example now points at the previous Opus id
Evidence

thinking is on by default

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

See this entry in the whole of v2.1.219 →