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.

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Claude Code v2.1.246

Refusal-fallback metadata attached to requests

Not switched on
Useful2 Signal5
Model Routing Notable

Requests carry fields for a fallback model used after a refusal, with nothing you can set.

Refusal-fallback metadata including fallback model, lane, credit code and original-model stamps is plumbed into requests, with no user-facing control.

What

Requests now carry a block of fields describing a fallback used after a model refusal, including the fallback model, its lane, a credit code and mint details, and stamp fields recording the original model, category, trigger and request id. Plumbing for that path; nothing here is user-settable.

Evidence

refusalFallbackModelLane: "visible"

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 v2.1.246 →