You'll notice
An unrecognized model id now produces an error telling you to update or map it with behavesAs or modelOverrides.
A new internal helper generates the error shown when a model id isn't described by the current build's model catalog, telling the user to update Claude Code or map the model via behavesAs/modelOverrides. This is part of a reworked served model catalog system that also handles masking, family-spelling verdicts, and behavesAs lookups for resolving models unknown to the client.
Names in the bundlebehavesAsmodelOverrides
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
Confirmed since
Anthropic's documentation has since written up modelOverrides, on Claude Code gateway compatibility guide.
* **Capabilities**: to give a gateway alias the capabilities of the model behind it, map that model's Anthropic ID to your alias with a [`modelOverrides`](/docs/en/errors#unrecognized-model-id-on-a-request) entry in the settings you distri…llm-gateway-protocol see the edit
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agrees
Anthropic's documentation has since written up modelOverrides, on Claude Code gateway compatibility guide.