Claude Code v2.1.276

Released Sep 18, 2026 · Anthropic

Upgraded to Claude Code v2.1.276?

Tell other builders how it went. Anonymous, one answer each; the tally shows once three people have answered.

I run

See what changed since, breaking first, with a prompt your agent can work from.

What's changed

Fixed every request failing with 400 … Input tag 'advisor_20260301' when ANTHROPIC_BASE_URL points at a proxy or gateway (2.1.275 regression)