Verdict
Kimi K3 leads 4–3 across 7 shared benchmarks.
Gemini 3.1 Pro 3 · Kimi K3 4 · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Math: Kimi K3 leads 2–0 across 2 shared math benchmarks (largest gap: FrontierMath-Tier-4-v2-Private, 39.02 vs 26.83 — single evaluator).
Reasoning: Gemini 3.1 Pro leads 2–0 across 2 shared reasoning benchmarks (largest gap: SimpleQA Verified, 77.3 vs 42.7 — 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 Kimi K3.
Kimi K3 leads 4–3 across 7 shared benchmarks. Gemini 3.1 Pro leads 3 benchmarks and Kimi K3 leads 4. Higher isn't always better — see the integrity caveats on each benchmark.
Gemini 3.1 Pro and Kimi K3 have 7 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
Kimi K3 leads math 2–0. Gemini 3.1 Pro leads reasoning 2–0.