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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 v2.1.229

Unknown-model context warning no longer suggests an impossible fix

You'll notice
Useful2 Signal1
Models

The unknown-model warning only suggests the [1m] suffix when that would actually help.

[1m]
What

The warning shown for a model Claude Code does not recognize only tells you to append [1m] to the model name when the assumed context window is smaller than 1M. Otherwise it says the model accepts less.

Evidence

append [1m] to the model name for 1M

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 v2.1.229 →