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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.223 ·

Model alias reverse-lookup only applies to recognized models

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

You'll notice Bug Fixes
JSON All of v2.1.223
You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
ModelsArea: what it touches
Bug FixesKind: in v2.1.223,
Bug FixesSection of the release
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.

Read from
Names in the bundlemodelOverrides
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeFixed modelOverrides keys that aren't Anthropic model IDs being treated as the session's canonical model ID; unknown keys are now ignored as…

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