Verdict
Gemini 3 Pro leads 16–2 across 18 shared benchmarks.
Gemini 3 Pro 16 · GPT-5.1 2 · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Reasoning: Gemini 3 Pro leads 5–0 across 5 shared reasoning benchmarks (largest gap: SimpleBench, 71.68 vs 43.84 — single evaluator).
Math: Gemini 3 Pro leads 3–0 across 3 shared math benchmarks (largest gap: FrontierMath-2025-02-28-Private, 65.96 vs 54.45 — 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.
Context Handling
“state-of-the-art reasoning, vision and spatial understanding, leading multilingual performance, and 1 million-token context window”
Multimodal
“It's the best model in the world for multimodal understanding and our most powerful agentic and vibe coding model yet”
Reasoning
“It's state-of-the-art in reasoning, built to grasp depth and nuance”
No vendor claims on file for GPT-5.1.
Gemini 3 Pro leads 16–2 across 18 shared benchmarks. Gemini 3 Pro leads 16 benchmarks and GPT-5.1 leads 2. Higher isn't always better — see the integrity caveats on each benchmark.
Gemini 3 Pro and GPT-5.1 have 18 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
Gemini 3 Pro leads reasoning 5–0. Gemini 3 Pro leads math 3–0.