Devstral Small 2 (24B) 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 32 days before Devstral Small 2 (24B), so benchmark comparisons should account for the intervening progress.

Devstral Small 2 (24B) is open weight, while GPT-5-Codex-Mini is proprietary.

Direct benchmark comparisons are unavailable — Devstral Small 2 (24B) and GPT-5-Codex-Mini don't publish scores on any of the same benchmarks.