Verdict
GPT-5 leads 11–1 across 12 shared benchmarks.
DeepSeek-R1 1 · GPT-5 11 · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Reasoning: GPT-5 leads 3–0 across 3 shared reasoning benchmarks (largest gap: ARC-AGI, 65.67 vs 15.8 — single evaluator).
Math: GPT-5 leads 2–0 across 2 shared math benchmarks (largest gap: OTIS Mock AIME 2024-2025, 91.38 vs 53.29 — single evaluator).
Vendor claims — compare against the measured scores above. A claim is what a developer says about its own model, not an independent measurement.
Reasoning
“After these steps, we obtained a checkpoint referred to as DeepSeek-R1, which achieves performance on par with OpenAI-o1-1217.”
“For education-oriented knowledge benchmarks such as MMLU, MMLU-Pro, and GPQA Diamond, DeepSeek-R1 demonstrates superior performance compared to DeepSeek-V3.”
No vendor claims on file for GPT-5.
GPT-5 leads 11–1 across 12 shared benchmarks. DeepSeek-R1 leads 1 benchmark and GPT-5 leads 11. Higher isn't always better — see the integrity caveats on each benchmark.
DeepSeek-R1 and GPT-5 have 12 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
GPT-5 leads reasoning 3–0. GPT-5 leads math 2–0.