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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 v2.1.42 13 Feb 2026

Cache Editing for Microcompact

What

Cache editing beta header is now enabled for cached microcompact operations.

Details

Only applies to first-party API users in the main REPL thread
Improves performance when working with compacted conversations

Evidence

Cache editing (search for "Cache editing beta header enabled for cached microcompact")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.42 →