Claude Opus 5.5 vs. Claude Sonnet 5.5

Quick Verdict: Route autonomous coding to Claude Opus 5.5 (84.2% SWE-bench Verified), hard scientific reasoning to Claude Opus 5.5 (94.1% GPQA Diamond), and high-volume cost-sensitive workloads to Claude Sonnet 5.5.

Claude Opus 5.5 (Anthropic)

94.6 pt

SWE: 84.2% · GPQA: 94.1% · $6.00/1M · Adopt Now

Claude Sonnet 5.5 (Anthropic)

92.8 pt

SWE: 82.9% · GPQA: 91.4% · $3.00/1M · Adopt Now

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