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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 v2.0.77

Custom Betas Validation for API Users

What

API key users can now specify custom beta headers, with validation against an allowlist.

Details
  • Only the context-1m-2025-08-07 beta is currently allowed
  • Warnings are shown for disallowed beta headers
  • OAuth users cannot use custom betas (server-controlled)
Evidence

JrQ() at line 140738 (beta validation, contains "Custom betas are only available for API key users")

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 v2.0.77 →