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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 v2.1.233

Warning when an unrecognized model is sent to the API

You'll notice
Useful2 Signal2
Elsewhere

You get a one-time warning line if a query names a model Claude Code does not recognise.

What

If a query names a model Claude Code does not recognize, it now warns once per model, printing a line starting with [claude-code:unrecognized_model] followed by the model name and where the query came from.

Details
  • In non-interactive sessions the line goes to stdout, except when CLAUDE_CODE_SESSION_KIND is bg, where it is logged at warn level instead.
  • Also fires the telemetry event tengu_api_unrecognized_model with the model and query source.
  • The warning fires at most once per distinct model per session.
Evidence

[claude-code:unrecognized_model]

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.233 →