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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

/btw side questions show a fallback-model notice

You'll notice
Useful3 Signal0
Slash Commands

Side questions now show a banner naming the original and fallback model instead of switching silently.

/btw
What

When a side question falls back to a different model, the answer is now preceded by a warning banner naming the original and fallback models instead of silently switching.

Details
  • The side-question flow returns a refusalFallback object carrying the original model, the fallback model and the notice content alongside the response.
  • The UI renders the banner above the answer only when a fallback is present.
  • The control-request response carries the same information as refusal_fallback with original_model, fallback_model and content fields.
Evidence

fallbackNotice

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 →