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:
- Antigravity CLI v1.2.6 (September 18, 2026)
- OpenAI Codex CLI rust-v0.155.0 (September 17, 2026)
- GitHub Copilot CLI v1.0.86 (September 17, 2026)
- Antigravity CLI v1.2.5 (September 17, 2026)
- Antigravity CLI v1.2.4 (September 16, 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 every request failing with 400 … Input tag 'advisor20260301' when ANTHROPICBASEURL points at a proxy or gateway (2.1.275 regression)
Other Recent Claude Code Releases
- v2.1.274 (September 16, 2026)
- v2.1.273 (September 15, 2026)
- v2.1.272 (September 14, 2026)
- v2.1.271 (September 14, 2026)
- v2.1.270 (September 12, 2026)
All Claude Code releases · All AI coding tool releases on Havoptic