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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 v2.1.228

The gateway now requires a model in the request body

You'll notice
Useful2 Signal2
Gateway

The self-hosted gateway now rejects requests that omit a model with a 400.

What

A request with no model field, or an empty one, is now a 400. Previously a missing model was tolerated and only type-checked when present. The allowlist rejection message also escapes the model name before echoing it back.

Evidence

model is required

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 v2.1.228 →