Mellum2

Overview

Mellum2 is a 12B mixture‑of‑experts model released under Apache 2.0 by JetBrains, trained on 10.6 trillion tokens and oriented toward AI workflows for developers.[6] Its open license and coding-focus make it suitable as a foundation for IDE integrations, local code assistants, and custom agent backends.[6] Tooling developers should care because it provides a modern, high-capacity open model they can embed into editors and CI systems without vendor lock‑in.