Everything about Magistral Small 1.2

Overview

Mistral AI released Magistral Small 1.2 on September 18, 2025. It has a reasoning mode: it can "think" before answering, which helps with multi-step problems but uses more tokens, and therefore more money. Its weights are published: you can download it and run it on your own servers, or use one of the 1 API providers that list it on models.dev. That makes it more than a year old: successors may have shipped since.

We file it under open-weight models (68 models in this category on the site).

How much does Magistral Small 1.2 cost?

Magistral Small 1.2 costs $0.50 per million input tokens and $1.5 per million output tokens (median of 1 providers, checked on October 22, 2026).

To put it in perspective: reading 20,000 tokens (about thirty pages) and writing 2,000 costs roughly $0.013; a thousand of those tasks, $13.

That is 1.5 times the median output price of open-weight models ($1).

To estimate your own budget, use the agent cost calculator.

Benchmark results

Epoch AI publishes 2 results for Magistral Small 1.2 on our basket's benchmarks: too few to compute a reliable capability index.

• GPQA Diamond (PhD-level science questions): 47.6% — the best tracked model, Gemini 4 Argon, reaches 96.4%
• OTIS Mock AIME (competition mathematics problems): 28.1% — the best tracked model, GPT-5.5 Pro, reaches 100%

What it can do

Its context window reaches 128,000 tokens, roughly 192 pages of text at 500 words per page: enough for a medium-length document. A single answer can run to 40,000 tokens.

It accepts as input: text and image.

It can call tools (functions, APIs) and return structured JSON output, which makes it a possible foundation for an AI agent.

Who is it for?

Given its category, Magistral Small 1.2 is mainly aimed at projects where you want control over your data or hosting, or want to adapt the model to your field.

Before adopting it, test it on your own examples: benchmarks measure standard tasks, not your job.

Alternatives

In the same category, the models closest to Magistral Small 1.2 are:

• Mistral Large 3 (Mistral AI, $1.5 per million output tokens)
• Step 3.7 Flash (StepFun, $1.21 per million output tokens)
• MiniMax-M3 (MiniMax, index 55.5)
• Muse Glimmer 30B (Meta, $1.2 per million output tokens)