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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 v2.1.221

Fast mode availability text drops Opus 4.7

You'll notice
Useful2 Signal0
Models

Fast mode availability text now lists only Opus 5 and 4.8.

What

The environment prompt describing fast mode now lists Opus 5 and 4.8 only, where it previously also listed 4.7.

Details
  • changed in both places the blurb is emitted
Evidence

It can be toggled with /fast and is available on Opus 5/4.8.

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 v2.1.221 →