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Magistral Medium 2509

Magistral Medium 2509 is Mistral AI's reasoning model for enterprise use, with 73.6% on AIME 2024 (single-sample), traceable chain-of-thought, and multilingual reasoning across eight languages.

ReasoningVision (Image)
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'mistral/magistral-medium',
  prompt: 'Why is the sky blue?'
})
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About Magistral Medium 2509

Announced March 17, 2025, Magistral Medium 2509 is Mistral AI's first dedicated reasoning model and the more capable of the two Magistral variants. Magistral Medium 2509 scores 73.6% on AIME 2024, a standard mathematical reasoning benchmark, and reaches 90% with majority voting at 64 samples.

Magistral Medium 2509 produces traceable chain-of-thought (CoT) reasoning, exposing each inferential step rather than returning only a final answer. This transparency targets enterprise use cases in regulated industries like finance, legal, and healthcare.

Multilingual reasoning spans English, French, Spanish, German, Italian, Arabic, Russian, and Simplified Chinese. A single deployment can serve global teams without language-specific fallbacks.