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