JetBrains drops Mellum2, a 12B MoE model built for speed
JetBrains just released Mellum2, an open-source 12B Mixture-of-Experts model under the Apache 2.0 license. By activating only 2.5B parameters per token, it cuts latency and runs more than 2x faster than similarly sized open models. It is built to handle high-frequency plumbing like routing, RAG compression, and sub-agents across software engineering stacks.