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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 v2.1.223

Model alias reverse-lookup only applies to recognized models

You'll notice
Useful3 Signal0
Models

Model name overrides no longer swap in an alias pointing at a model the client doesn't know.

modelOverrides
What

Mapping a model string back through modelOverrides no longer substitutes an override key that points at a model the client does not know.

Details
  • A candidate key is returned only if it maps to a model the client recognizes.
  • "No match" is now represented by undefined rather than by returning the input unchanged.
  • Previously any override key whose value matched was substituted verbatim.
  • The application-inference-profile fallback path is unchanged.
Evidence

application-inference-profile

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 v2.1.223 →