Claude Code v2.1.276

Claude Code v2.1.276 was released on .

Summary

Claude Code 2.1.276 fixes a critical issue that was causing all requests to fail when using proxy or gateway setups. We've resolved the input tag error that appeared in the previous version, restoring smooth operation for enterprise deployments. Check the full release notes to...

Release Context

  • This was the 221st Claude Code release of 2026 tracked by Havoptic.
  • It shipped the same day as Claude Code v2.1.275 (September 17, 2026).
  • Claude Code: ships every 0.9 days — 31 releases in the last month.

Why it matters: Proxy requests working again.

Shipped around the same time

Within 3 days of this release, other AI coding tools also shipped:

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 every request failing with 400 … Input tag 'advisor20260301' when ANTHROPICBASEURL points at a proxy or gateway (2.1.275 regression)

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