Verdict
GPT-5 leads 16–2 across 18 shared benchmarks.
Claude Opus 4.1 2 · GPT-5 16 · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Reasoning: GPT-5 leads 4–1 across 5 shared reasoning benchmarks (largest gap: SimpleQA Verified, 50.6 vs 34.8 — single evaluator).
Unknown: GPT-5 leads 3–0 across 3 shared unknown benchmarks (largest gap: EBR-bench, 12.7 vs 7.94 — single evaluator).
Math: GPT-5 leads 2–0 across 2 shared math benchmarks (largest gap: OTIS Mock AIME 2024-2025, 91.38 vs 68.86 — single evaluator).
GPT-5 leads 16–2 across 18 shared benchmarks. Claude Opus 4.1 leads 2 benchmarks and GPT-5 leads 16. Higher isn't always better — see the integrity caveats on each benchmark.
Claude Opus 4.1 and GPT-5 have 18 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
GPT-5 leads reasoning 4–1. GPT-5 leads unknown 3–0.