Source Intelligence

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.

All of v2.1.251 Home All releases olderv2.1.250
Claude Code v2.1.251

Refusal-fallback model switching is now its own tracked setting

Use it now
Useful2 Signal2
Settings not in their notes

The setting that switches models on a flagged refusal now records when you change it.

switchModelsOnFlag
What

The switchModelsOnFlag setting, which automatically switches models when a response is flagged as a refusal, now reports its own telemetry event when you change it. It only appears when a gating check passes.

Details
  • The gating helper was renamed in this build; several unrelated functions share its minified name, so what it actually checks is not resolved here.
Evidence

tengu_refusal_fallback_setting_changed

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

See this entry in the whole of v2.1.251 →