LaunchDevelopersSeptember 18, 2026

Claude Code 2.1.276 fixes 400 errors behind proxies

Read original source →code.claude.com

Claude Code 2.1.276 patches a 2.1.275 regression that made every request fail with a 400 "Input tag 'advisor_20260301'" error when ANTHROPIC_BASE_URL points at a proxy or gateway. The prior day's 2.1.276-era release added a send-now key (ctrl+enter) and syncing of claude.ai skills and plugins to terminal sessions.

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Claude Code 2.1.276 fixes 400 errors behind proxies