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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.

← All of v2.1.39 Home All releases ←olderv2.1.38 v2.1.40newer→
Claude Code v2.1.39

Terminology Update: Penguin Mode → Fast Mode

Internal references to "penguin mode" have been renamed to "fast mode" for consistency with user-facing terminology.

Evidence

Renamed status messages (search for "Org fast mode:" vs old "Org penguin mode:")

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 v2.1.39 →