Claude Code 2.1.276 fixes 400 errors for all requests when ANTHROPIC_BASE_URL uses a proxy
ClaudeCodeLog · x · 2026-09-18
Claude Code CLI 2.1.276 is out with one CLI change: it fixes 400 Input tag "advisor20260301" errors that broke all requests when ANTHROPICBASEURL pointed at a proxy or gateway, restoring normal operation.
Related event: Claude Code 2.1.276 Fixes Proxy Gateway 400 Regression(3 posts)→
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