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Reading a new release v2.1.251 Analysing changes · 2/5 Writing the entries · 2/4 steps 470 findings $18.91 so far

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 v2.1.30

Claude 4.5 Model Information

The system prompt now includes updated model family information: "The most recent Claude model family is Claude 4.5" with model IDs for Opus 4.5, Sonnet 4.5, and Haiku 4.5.

Evidence

Model info in system prompt (search for "The most recent Claude model family is Claude 4.5")

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 v2.1.30 →