Anthropic Deprecates Temperature, Top_P, and Top_K on Newer Opus Models
Anthropic has officially deprecated the use of custom temperature, top_p, and top_k values on Claude Opus 4.7 and later models, including Opus 4.8. Starting with these newer versions, setting any of these sampling parameters to non-default values now returns a 400 error. The change is part of Anthropic’s broader effort to simplify model behavior and…