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

JetBrains released Mellum2.1, an Apache 2.0 licensed 12B mixture-of-experts thinking model with 2.5B active parameters, aimed at coding agents. Reinforcement learning in real repositories raised the model's SWE-bench Verified score from 2.0 to 47.0.

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 JetBrains Releases Mellum2.1: A 12B MoE Open Model for Coding Agents https://www.marktechpost.com/2026/10/08/jetbrains-releases-mellum2-1-a-12b-moe-open-model-for-coding-agents/ appeared first on MarkTechPost https://www.marktechpost.com .