Tag: Mellum
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JetBrains Ships Mellum2.1, a 12B Open Model for Coding Agents
JetBrains released Mellum2.1 on October 8, 2026 — the next version of the 12-billion-parameter mixture-of-experts model it open-sourced in June. The architecture is unchanged, the license is still Apache 2.0, and the weights are on Hugging Face. What changed is everything after pre-training: JetBrains says the update was driven by scaling up reinforcement learning in […]