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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 v2.1.221

Local HTTP API rejects non-string model fields

You'll notice
Useful2 Signal0
Elsewhere

The local HTTP API now returns a clear 400 when model isn't a string, instead of ignoring it.

What

A request body whose model key is not a string now fails loudly instead of having the field quietly ignored.

Details
  • Returns 400 with an invalid_request_error.
Evidence

model must be a string

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

See this entry in the whole of v2.1.221 →