Anthropic Claude Code v2.1.276 Fixes `400 Input tag` Error
sdkaiengineer
patch
Anthropic Claude Code v2.1.276 addresses a critical bug that caused all requests to fail with a `400 Input tag` error. This issue specifically affected users pointing `ANTHROPIC_BASE_URL` to a proxy or gateway. The patch resolves a regression introduced in version 2.1.275, ensuring proper functionality for these configurations.
Fixes (1) ›
Fixed every request failing with 400 … Input tag 'advisor_20260301' when ANTHROPIC_BASE_URL points at a proxy or gateway (2.1.275 regression)
Read the original announcement →
https://github.com/anthropics/claude-code/releases/tag/v2.1.276
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