Devstral 2 (123B)Open Weight

Devstral 2 (123B) was released by Mistral on Tuesday, Dec 9 2025.

Devstral 2 (123B) was built by Mistral. French AI company building open and commercial models. Founded in 2023 by former Meta and DeepMind researchers.

Partly. Devstral 2 (123B) is an open-weight model: the trained weights are free to download and run locally or on your own infrastructure, but the training data and code are not fully released and the license may restrict some commercial uses. It is not open source in the strict sense.

Mistral's previous tracked release was Mistral Large 3 on Dec 2 2025, 7 days earlier. It was followed by Devstral Small 2 (24B) on Dec 9 2025.