JetBrains open-sourced Mellum2 12B coding model

The New Stack

JetBrains open-sourced Mellum2, a 12B-parameter MoE coding model for agentic AI infrastructure (routing, retrieval, sub-agent tasks). The model targets private on-premises deployments where Claude Code cannot operate, with coding performance comparable to Qwen 3.5 9B.

mellum2mixture-of-experts

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Mellum 2 12B A2.5B9 days agoMiddle_Bullfrog_6173Discuss

The New Stack·Paul Sawers

9 days ago