You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
New FeaturesKind: in v2.1.233,
New FeaturesSection of the release
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.
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.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeImproved print mode diagnostics: a [claude-code:unrecognized_model] line is written to stderr when a request goes out for a model ID Claude…
