Devstral 2 (123B)
Notable release: A meaningful new model: a new size or version, or a strong free-to-download model from a known lab.Open model: Its files are public (open weights), so anyone can download it and run it on their own computer, usually for free.
Key facts
- Released
- Dec 9, 2025
- What it does
- Text and chat: Writes, answers questions and holds a conversation.
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- Knowledge cutoff
- December 2025 · the latest events it learned about
- 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
- “Introducing: Devstral 2 and Mistral Vibe CLI.”
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
- $0.40
- per million tokens
- Output
- $2.00
- 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 .
Compare Devstral 2 (123B) with
It came out 7 days after Mistral Large 3, the lab's previous model.
The details
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