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Mellum2.1 Gets to Work: A Fast Open Model for Coding Agents

Trained with reinforcement learning in real environments, Mellum2.1 is built for coding agents and fast sub-agents that run on your own hardware. Today, we're releasing Mellum2.1, the next version of the 12B mixture-of-experts model we open-sourced in June. The architecture hasn't changed since ver…

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  1. 2026-10-08 12:00 · JetBrains AI Blog
    Mellum2.1 Gets to Work: A Fast Open Model for Coding Agents

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