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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 v2.1.222

Model refusal fallback updates the shown model

You'll notice
Useful3 Signal0
Model Fallback

When a turn falls back to a different model after a refusal, the display now shows the model actually used.

What

When a turn falls back after a model refusal, the agent's displayed model is rewritten to the model actually used, and the fallback message now carries a scope.

Details
  • A new agent event kind propagates turn effort together with the turn model.
  • The async-agent reader applies system/model_refusal_fallback by rewriting the agent's model rather than leaving the old one on screen.
  • The optional scope field was added at three emit sites and in the parser.
Evidence

agent-turn-effort

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 v2.1.222 →