Mistral Large 3 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 175 days before Mistral Large 3, so benchmark comparisons should account for the intervening progress.

Mistral Large 3 is open weight, while o3-pro is proprietary.

Direct benchmark comparisons are unavailable — Mistral Large 3 and o3-pro don't publish scores on any of the same benchmarks.