Verdict
GPT-5.2 leads 18–8 across 26 shared benchmarks.
Claude Opus 4.5 8 · GPT-5.2 18 · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Unknown: GPT-5.2 leads 5–2 across 7 shared unknown benchmarks (largest gap: ProofBench, 36 vs 15 — single evaluator).
Reasoning: Evenly split 3–3 across 6 shared reasoning benchmarks (largest gap: SimpleBench, 54.4 vs 34.96 — single evaluator).
Math: GPT-5.2 leads 2–0 across 2 shared math benchmarks (largest gap: FrontierMath-Tier-4-v2-Private, 31.7 vs 4.88 — single evaluator).
GPT-5.2 leads 18–8 across 26 shared benchmarks. Claude Opus 4.5 leads 8 benchmarks and GPT-5.2 leads 18. Higher isn't always better — see the integrity caveats on each benchmark.
Claude Opus 4.5 and GPT-5.2 have 26 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
GPT-5.2 leads unknown 5–2. GPT-5.2 leads math 2–0.