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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

Model picker colours the new model names

You'll notice
Useful3 Signal0
Models Notable

The model picker now colours Fable 5, Mythos 5 and Sonnet 5 in its list.

claude-fable-5claude-mythos-5
What

Brand colouring in the model selection list now applies to the current lineup rather than a single name.

Details
  • Previously only "Opus 5" was coloured in the descriptions.
  • Now Fable 5, Mythos 5 and Sonnet 5 are coloured.
  • The registry entries claude-fable-5 and claude-mythos-5 were already present in the previous build; this is presentation only.
Evidence

"Mythos 5"

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 v2.1.221 →