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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 v2.1.228

Bundled API client: new endpoints and a stripped request field

Under the hood
Useful2 Signal4
API Client Notable

The bundled client swapped memory-version endpoints for deployment runs and added a threads resource.

What

The bundled Anthropic client swapped its memory-version endpoints for /v1/deployment_runs?beta=true, added a threads resource, and now removes user_profile_id from message, token-count and batch-create request bodies before sending.

Details
  • The model deprecation warning table gained claude-opus-4-1 and claude-opus-4-1-20250805 (August 5th, 2026) and claude-mythos-preview (June 30th, 2026).
Evidence

/v1/deployment_runs?beta=true

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 →