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JetBrains Releases Mellum2.1: A 12B MoE Open Model for Coding Agents

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JetBrains released Mellum2.1, an Apache 2.0, 12B mixture-of-experts thinking model with 2.5B active parameters. RL in real repositories lifted its SWE-bench Verified score from 2.0 to 47.0. The post J