AnalysisAI ModelsJuly 25, 2026

Opus 5 FrontierCode scores fall when effort exceeds high

Opus 5's effort dial has five settings — low, medium, high, xhigh, max — and FrontierCode coding scores drop above "high", per Anthropic's migration guide, which says the model starts making unnecessary changes at higher effort. Reaching for max may hurt coding performance.

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