# Claude API 2026-10-21: Temperature Is Gone, and Even the Default Breaks You

> Source: <https://byteiota.com/claude-api-2026-10-21-breaking-changes/>
> Published: 2026-10-22 06:17:24+00:00

Anthropic's first new API version in 3 years removes temperature entirely. Even default values return 400s. Here's every breaking change and how to migrate safely.

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Claude API 2026-10-21: Temperature Is Gone, and Even the Default Breaks You
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