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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 v2.1.248

A "fable" model family listed alongside opus and sonnet

Under the hood
Useful1 Signal3
Models

A model-validation list names fable alongside opus and sonnet.

A new list, not a new family; selectability is not settled here.

What

A list used near model validation now names three families: fable, opus and sonnet. The fable family already existed in the previous build, so this is a new list rather than a new family, and whether it is selectable is not settled by this code.

Evidence

var S = ["fable", "opus", "sonnet"];

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 v2.1.248 →