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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 v2.1.251

Bifrost and Databricks are recognized as AI gateways

You'll notice
Useful2 Signal2
Elsewhere

Bifrost and Databricks are now recognised as AI gateways in response labelling.

What

When your API traffic goes through a gateway, Claude Code labels the responses with which gateway it was. It now recognizes Bifrost, by an x-bifrost- response header prefix, and Databricks, by hostnames ending in .cloud.databricks.com, in addition to litellm, helicone, portkey, cloudflare, kong and braintrust. litellm also now reports its version from a dedicated header.

Details
  • Detection is passive: headers and hostname only, nothing is sent to the gateway to ask.
Evidence

x-bifrost-

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 v2.1.251 →