Mistral Large 3 and GPT-5-Codex-Mini don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5-Codex-Mini shipped 24 days before Mistral Large 3, so benchmark comparisons should account for the intervening progress.

Mistral Large 3 is open weight, while GPT-5-Codex-Mini is proprietary.

Direct benchmark comparisons are unavailable — Mistral Large 3 and GPT-5-Codex-Mini don't publish scores on any of the same benchmarks.