Release archive

Claude Code v2.1.276: Fix for 400 Errors Through Proxies and Gateways

Claude Code v2.1.276 is a single-fix release: requests no longer all fail with a 400 error naming the input tag advisor_20260301 when ANTHROPIC_BASE_URL points at a proxy or gateway, a 2.1.275 regression.

• 10 min read • By ClaudeWorld

Claude Code v2.1.276 is a patch release with a single changelog entry. It fixes a regression from 2.1.275 that affected setups routing requests through a proxy or gateway.

What’s New

When ANTHROPIC_BASE_URL points at a proxy or gateway, requests no longer all fail with 400 … Input tag 'advisor_20260301'. This failure was a regression in 2.1.275.

How to Update

  1. Check your installed version: claude --version
  2. Update in place: claude update