Mistral Medium 3.1

Mistral Medium 3.1 is Mistral AI's frontier-class multimodal model, released August 12, 2025 (API ID mistral-medium-2508). It processes text and images with a 128K-token context window, supports external tools and APIs, and generates structured data — positioned as the enterprise sweet spot between the cheap Small line and the flagship Large models. At $0.40 per million input tokens and $2.00 output, it undercuts most frontier multimodal APIs while scoring 21.3 on the Artificial Analysis Intelligence Index, well above the median for its price tier.

The honest picture: it's a proprietary API-only model — Mistral's open-weights generosity doesn't extend to the Medium line. It's not a reasoning model, so complex multi-step problems go to Magistral or competitors' thinking models instead. Output speed (82 tok/s) trails the median for its tier, and the 128K context looks modest next to 1M-context rivals. It's a value-frontier play, not a capability-frontier one.