Claude Code 2.1.276 is out about six hours after 2.1.275. The single CLI fix restores requests that failed with 400 Input tag "advisor_20260301" when ANTHROPIC_BASE_URL pointed at a proxy or gateway — a 2.1.275 regression.
Key Takeaways
- ✓Fixes the 2.1.275 regression where every request failed with 400 Input tag advisor_20260301 when ANTHROPIC_BASE_URL pointed at a proxy or gateway.
- ✓Single CLI change; critical for Claude Code users behind custom base URLs or enterprise proxies.
- ✓Changelog: anthropics/claude-code CHANGELOG.md#21276.
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