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Claude Code v2.1.266 Fixes a Regression That Broke LLM Gateway Setups

Claude Code Release ★★ View Markdown
#anthropic#ai#devops

Hey, it's me, Shiichan! Today's a small but important fix from Claude Code.

Claude Code Release github.com

What was announced?

Claude Code Release announced version v2.1.266. This isn't a new feature — it's a fix for a regression that shipped in the previous version, v2.1.265.

The story so far

In v2.1.265, the undocumented CLAUDE_CODE_USE_GATEWAY environment variable started behaving differently. It used to be ignored unless both ANTHROPIC_BASE_URL and ANTHROPIC_AUTH_TOKEN were set, but in v2.1.265 it began forcing Cloud gateway sign-in on its own. That broke every request with a "Not signed in to the Cloud gateway" error for anyone running LLM-gateway or proxy setups that set this variable alongside an API key, an apiKeyHelper, or custom auth headers.

What changes

In v2.1.266, CLAUDE_CODE_USE_GATEWAY on its own goes back to being ignored, just like before. No configuration changes are needed — updating is enough to fix it.

Wrap-up

  • Claude Code v2.1.266 fixes a regression introduced in v2.1.265
  • The bug broke every request for LLM-gateway/proxy setups combining CLAUDE_CODE_USE_GATEWAY with an API key or custom auth
  • v2.1.266 restores the original behavior — the variable alone is ignored again
  • No configuration changes needed, just update
  • Worth updating if you run Claude Code through your own LLM gateway or proxy

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