Verdict
Gemini 3.1 Pro leads 14–7 across 21 shared benchmarks.
Gemini 3.1 Pro 14 · GPT-5.2 7 · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Reasoning: Gemini 3.1 Pro leads 5–0 across 5 shared reasoning benchmarks (largest gap: SimpleBench, 75.52 vs 34.96 — single evaluator).
Unknown: Gemini 3.1 Pro leads 3–1 across 4 shared unknown benchmarks (largest gap: Mystery Game Puzzles, 27.3 vs 15.18 — single evaluator).
Math: GPT-5.2 leads 2–0 across 2 shared math benchmarks (largest gap: FrontierMath-Tier-4-v2-Private, 31.7 vs 26.83 — 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.
Agentic / Tool Use
“Gemini 3.1 Pro was evaluated across a range of benchmarks, including reasoning, multimodal capabilities, agentic tool use, multi-lingual performance, and long-context.”
Multimodal
“a suite of highly capable, natively multimodal reasoning models”
Reasoning
“Gemini 3.1 Pro is Google's most advanced model for complex tasks.”
No vendor claims on file for GPT-5.2.
Gemini 3.1 Pro leads 14–7 across 21 shared benchmarks. Gemini 3.1 Pro leads 14 benchmarks and GPT-5.2 leads 7. Higher isn't always better — see the integrity caveats on each benchmark.
Gemini 3.1 Pro and GPT-5.2 have 21 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
Gemini 3.1 Pro leads reasoning 5–0. Gemini 3.1 Pro leads unknown 3–1.