Claude Code v2.1.266
Claude Code v2.1.266 was released on .
Summary
Claude Code 2.1.266 resolves a critical authentication issue that broke proxy and gateway setups in the previous version. We've restored the proper behavior so your existing configurations work seamlessly again without any changes needed. Check the full notes to see what else ...
Release Context
- This was the 211th Claude Code release of 2026 tracked by Havoptic.
- It shipped the same day as Claude Code v2.1.265 (September 8, 2026).
- Claude Code: ships every 1 days — 28 releases in the last month.
Why it matters: Proxy setups work again without configuration changes.
Shipped around the same time
Within 3 days of this release, other AI coding tools also shipped:
- Antigravity CLI v1.2.0 (September 10, 2026)
- OpenAI Codex CLI rust-v0.154.0 (September 9, 2026)
- Antigravity CLI v1.1.28 (September 9, 2026)
- Grok Build v1.0.25 (September 9, 2026)
- Gemini CLI v0.59.0 (September 8, 2026)
Compare Claude Code: vs OpenAI Codex CLI · vs Cursor · vs Gemini CLI · vs Kiro CLI · vs GitHub Copilot CLI · vs Devin Desktop · vs Antigravity CLI · vs Grok Build
Release Notes
- Fixed a 2.1.265 regression affecting LLM-gateway and proxy setups: the undocumented CLAUDECODEUSEGATEWAY environment variable, previously ignored unless ANTHROPICBASEURL and ANTHROPICAUTHTOKEN were both set, began forcing Cloud-gateway sign-in on its own in 2.1.265, so configurations that set it alongside an API key, apiKeyHelper, or custom auth headers failed every request with "Not signed in to the Cloud gateway". The variable on its own is ignored again; no configuration change is needed
Other Recent Claude Code Releases
- v2.1.263 (September 6, 2026)
- v2.1.261 (September 4, 2026)
- v2.1.260 (September 3, 2026)
- v2.1.259 (September 2, 2026)
- v2.1.258 (September 1, 2026)
All Claude Code releases · All AI coding tool releases on Havoptic