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 v2.1.228 Home All releases olderv2.1.227 v2.1.229newer
Claude Code v2.1.228

Model capability list fetched from the API

Not switched on
Useful2 Signal5
Models Notable

Claude Code can ask the API which models exist and store their capabilities, but the fetch is short-circuited.

A model-capability fetch is written and saved to disk, but a guard stops the network call entirely in this build.

What

A new routine asks the API for the list of models, records a capability entry for each and saves them. Two guard checks run before any network call and one of them short-circuits it entirely in this build, so no fetch happens. Failures log a single line.

Details
  • The request can optionally carry a beta header.
  • The failure line is prefixed [modelCapabilities] fetch failed: .
Evidence

[modelCapabilities] fetch failed:

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 v2.1.228 →