{"slug": "jetbrains-releases-mellum2-1-a-12b-moe-open-model-for-coding-agents", "title": "JetBrains Releases Mellum2.1: A 12B MoE Open Model for Coding Agents", "summary": "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.", "body_md": "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.\n\nThe 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).", "url": "https://wpnews.pro/news/jetbrains-releases-mellum2-1-a-12b-moe-open-model-for-coding-agents", "canonical_source": "https://www.marktechpost.com/2026/10/08/jetbrains-releases-mellum2-1-a-12b-moe-open-model-for-coding-agents/", "published_at": "2026-10-08 16:17:35+00:00", "updated_at": "2026-10-08 16:46:30.646653+00:00", "lang": "en", "topics": ["artificial-intelligence", "large-language-models", "ai-agents", "ai-tools", "developer-tools"], "entities": ["JetBrains", "Mellum2.1", "SWE-bench Verified"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/jetbrains-releases-mellum2-1-a-12b-moe-open-model-for-coding-agents", "markdown": "https://wpnews.pro/news/jetbrains-releases-mellum2-1-a-12b-moe-open-model-for-coding-agents.md", "text": "https://wpnews.pro/news/jetbrains-releases-mellum2-1-a-12b-moe-open-model-for-coding-agents.txt", "jsonld": "https://wpnews.pro/news/jetbrains-releases-mellum2-1-a-12b-moe-open-model-for-coding-agents.jsonld"}}