JetBrains Open-Sources Mellum 2.1 Code Models

JetBrains released Mellum 2.1, a major update to its open-source code models, featuring greatly scaled RL post-training for agentic coding and a 12B-parameter MoE variant with about 2.5B active parameters.

2026-10-08 ~ 2026-10-08 · 2 related posts

• JetBrains open-sources Mellum2.1 with scaled RL post-training for agentic coding — huggingface · 2026-10-08
• JetBrains releases Mellum 2.1, a 12B-A2.5B MoE coding model with GGUF — ApprehensiveAd3629 · 2026-10-08