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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.239 ·

Requesting a model you are not permitted to use can now step down instead of failing

Switching to a model you aren't allowed to use now falls back to a substitute instead of failing.

You'll notice New Features
JSON All of v2.1.239
You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
ModelsArea: what it touches
New FeaturesKind: in v2.1.239,
New FeaturesSection of the release
What

When a program switches models mid-session through the control channel, a name that is recognized but not permitted no longer just gets blocked; a substitute model is picked instead.

Details
  • The requested name is classified as default, unrecognized, allowed, blocked or stepped down.
  • An unrecognized name still returns the shape it expected plus a suggestion, and is reported as tengu_set_model_unrecognized.
Evidence

steppedDown

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

See this entry in the whole of v2.1.239 →

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