Mistral Medium 3.5
Key facts
- Released
- Apr 29, 2026
- What it does
- Text and chat: Writes, answers questions and holds a conversation.Thinks first: Can reason step by step before it answers: slower, but better at maths, code and tricky questions.Sees images: Understands pictures, screenshots and charts you share with it.Reads files: Reads documents such as PDFs.
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- How
- Free to download, with some licence limits
- Size
- Parameters: The numbers a model learns during training: a rough measure of its size. Bigger usually means more capable, but slower and pricier to run. 7B means 7 billion.
- Announced as
- “Mistral Medium 3.5 128B”
From trckr's archive of releases before it started watching. Date and details from Epoch AI's database of AI models (CC BY 4.0).
Price and limits
What developers pay to use it through the API: How developers plug a model into their own apps and pay per use. A model that's "in the API" can be used by programmers, even if it isn't in a chat app yet., per million Tokens: The small chunks of text a model reads and writes, about three-quarters of a word each. Prices and limits are counted in tokens. sent (input) or written back (output), and how much it can take in at once.
- Input
- $1.50
- per million tokensCached: $0.15
- Output
- $7.50
- per million tokens
- Context window: How much a model can keep in mind at once: your question, any files you share and its own replies. Measured in tokens; 1,000 tokens is about 750 words.
- 262K tokens
- about 200,000 words
From the lab's own listing on models.dev and OpenRouter, checked .
How it scores
From independent testers, never the lab's own claims.
- Combined test score#109 of 235
- GPT-6 Astra169
- 2GPT-6.1 Sol169
- 108Gemma 4 26B A4B142
- 109Mistral Medium 3.5142
- 110Kimi K2141
Source: Epoch AI · Epoch Capabilities Index
Compare Mistral Medium 3.5 with
It came out 44 days after Mistral Small 4, the lab's previous model.
The details
Model ID: The exact name developers type to use a model, like gpt-5-mini. New IDs often show up in a lab's systems before the official announcement, which is how trckr spots many releases early.
mistral-medium-2604Timeline
/Mistral APIOfficialFirst signal
mistral-medium-2604
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