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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 v2.1.242

Server-side refusal fallbacks documented as supported on Claude Platform on AWS

You'll notice
Useful3 Signal4
Model Docs not in their notes

Server-side refusal fallbacks are now documented as working on Claude Platform on AWS, not just the Claude API.

fallbacks
What

The fallbacks request parameter, which lets the server retry a refused request against another model, is now documented as available on the Claude API and Claude Platform on AWS. It was previously Claude-API-only with AWS support described as still being validated.

Details
  • Bedrock, Vertex and Foundry are still excluded and keep the client-side middleware instead.
  • A new row in the platform-availability table names both beta headers: server-side-fallback-2026-07-01 for the "default" form and server-side-fallback-2026-06-01 for the array form.
Evidence

available on the Claude API and Claude Platform on AWS

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 v2.1.242 →