Claude Code 2.1.265 Broke Gateway Auth, 2.1.266 Fixes It the Next Day
Claude Code 2.1.266 fixes a 2.1.265 regression where the undocumented CLAUDE_CODE_USE_GATEWAY variable forced Cloud-gateway sign-in and broke setups using an API key, apiKeyHelper, or custom auth headers.
What it is
A same-week follow-up patch release for Claude Code, addressing a bug introduced by the immediately prior version.
What it does
Restores the old behavior where CLAUDE_CODE_USE_GATEWAY on its own is ignored unless ANTHROPIC_BASE_URL and ANTHROPIC_AUTH_TOKEN are also set. In 2.1.265 that variable started forcing Cloud-gateway sign-in by itself, which broke any proxy or gateway setup using an API key, apiKeyHelper, or custom auth headers with a "Not signed in to the Cloud gateway" error on every request.
Why it matters
Teams running Claude Code through an LLM gateway got a hard outage for a day from an env var nobody documented, a reminder that undocumented flags can still be load-bearing in production.
How to use it
Update to 2.1.266 or later; no configuration change is needed since the fix restores prior behavior automatically.
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