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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 v2.1.248

Reasoning effort levels and their aliases

Use it now
Useful4 Signal4
Model Settings Notable

Reasoning effort accepts low through max, with med and ultracode as aliases.

lowmediumhighxhighmax
What

Reasoning effort accepts low, medium, high, xhigh and max, with med accepted as an alias for medium and ultracode as an alias for xhigh.

Details
  • A related state object gained unusableWritingOverrideTold, defaulting to false, tracking whether a one-time notice has been shown.
Evidence

["low", "medium", "high", "xhigh", "max"]

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 v2.1.248 →