Gemini 3.1 Flash and o3-pro don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. o3-pro shipped 261 days before Gemini 3.1 Flash, so benchmark comparisons should account for the intervening progress.

Published specifications for these two models are limited — see each model page for the latest details.

Direct benchmark comparisons are unavailable — Gemini 3.1 Flash and o3-pro don't publish scores on any of the same benchmarks.