Devstral 2 (123B) and o1-pro don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. o1-pro shipped 265 days before Devstral 2 (123B), so benchmark comparisons should account for the intervening progress.

Devstral 2 (123B) is open weight, while o1-pro is proprietary.

Direct benchmark comparisons are unavailable — Devstral 2 (123B) and o1-pro don't publish scores on any of the same benchmarks.