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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 v2.1.246

Model alias table lists fable, mythos and opus 5

You'll notice
Useful4 Signal5
Models Notable

The short-name model table now lists fable-5, mythos-5, opus-5 and opus-4-8 alongside the usual names.

opus-5fable-5mythos-5opus-4-8
What

The table mapping short model names to full model ids was refreshed and now includes fable-5, mythos-5, opus-5 and opus-4-8 alongside the existing opus, sonnet and haiku entries. An alias being listed does not mean the model is available to your account.

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 v2.1.246 →