Mistral Small 3.1 and o4-mini-high don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Mistral Small 3.1 shipped 30 days before o4-mini-high, so benchmark comparisons should account for the intervening progress.

Mistral Small 3.1 is open weight, while o4-mini-high is proprietary.

Direct benchmark comparisons are unavailable — Mistral Small 3.1 and o4-mini-high don't publish scores on any of the same benchmarks.