APIDir Model cost calculator
Product updateVerified

v2.1.276

## 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)

Claude CodeproductAnthropiccompany

Evidence chain

Anthropic Claude Code GitHub releasesFirst-party repository · official

## 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)

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External discussion

No reviewed external discussion has been linked yet. This does not change the evidence confidence.