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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 no longer offered on Opus 4.7

You'll notice
Useful4 Signal0
Models Notable not in their notes

Fast mode is no longer offered on Opus 4.7, only on newer Opus models.

fast_mode
What

The fast_mode capability was dropped from the baked-in catalog entry for claude-opus-4-7, and the eligibility check no longer name-matches that model.

Details
  • Name matching is now limited to opus-4-8 and opus-5, plus an explicit capability in the catalog.
  • Net effect in this build: fast mode is not available on Opus 4.7.
Evidence

return n.includes("opus-4-8") || n.includes("opus-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 v2.1.221 →