Verdict
GPT-5.4 leads 19–3 across 22 shared benchmarks.
Claude Opus 4.5 3 · GPT-5.4 19 · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Unknown: GPT-5.4 leads 6–1 across 7 shared unknown benchmarks (largest gap: ProofBench, 56 vs 36 — single evaluator).
Reasoning: GPT-5.4 leads 3–2 across 5 shared reasoning benchmarks (largest gap: DeepResearch Bench, 54.8 vs 35.1 — single evaluator).
Math: GPT-5.4 leads 2–0 across 2 shared math benchmarks (largest gap: FrontierMath-Tier-4-v2-Private, 49 vs 4.88 — single evaluator).
GPT-5.4 leads 19–3 across 22 shared benchmarks. Claude Opus 4.5 leads 3 benchmarks and GPT-5.4 leads 19. Higher isn't always better — see the integrity caveats on each benchmark.
Claude Opus 4.5 and GPT-5.4 have 22 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
GPT-5.4 leads unknown 6–1. GPT-5.4 leads math 2–0.