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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 v2.1.58

Updated Haiku model descriptions

What

The model picker descriptions for Haiku were reorganized internally. Both Haiku 3.5 and Haiku 4.5 remain available; the user-facing text ("Haiku 4.5 ยท Fastest for quick answers" and "Haiku 3.5 for simple tasks") is unchanged.

Evidence

Model option functions at lines ~530549 and ~530558 (search for "Fastest for quick answers")

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 v2.1.58 →