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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.0.77 ·

Custom Betas Validation for API Users

Entry
JSON All of v2.0.77
EntryKind: in v2.0.77,
ChangesSection of the release
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.

See this entry in the whole of v2.0.77 →

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