Claude Code v2.1.221 ·
Fast mode no longer offered on Opus 4.7
Fast mode is no longer offered on Opus 4.7, only on newer Opus models.
You'll notice Notable
No documentation found Removed
JSON
All of v2.1.221
You'll noticeTier: how much it should matter to you
4Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
ModelsArea: what it touches
RemovedKind: in v2.1.221,
What probably matters to youSection of the release
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.
Names in the bundlefast_mode
See this entry in the whole of v2.1.221 →
