JetBrains Releases Mellum2, a 12B Mixture-of-Experts Model

Jul 10, 2026

JetBrains has introduced Mellum2, a 12-billion-parameter Mixture-of-Experts (MoE) model, as announced on the Hugging Face Blog. The model leverages MoE architecture for efficient performance and marks JetBrains' entry into the large language model space.

Why it matters: Mellum2 adds a significant new option to the open-source LLM landscape, combining a 12B parameter count with Mixture-of-Experts efficiency.

Full story at: Hugging Face Blog ↗