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Tools & PlatformsHugging Face - Blog · June 1, 2026

Introducing Mellum2: A 12B Mixture-of-Experts Model by JetBrains

JetBrains has unveiled Mellum2, a new 12-billion-parameter Mixture-of-Experts (MoE) large language model. This model, a successor to Mellum, is designed to generate high-quality code and support various programming tasks.

Author: Morein.ai Editorial

JetBrains has officially introduced Mellum2, a powerful new large language model (LLM) built with a Mixture-of-Experts (MoE) architecture. Boasting 12 billion parameters, Mellum2 is a significant advancement over its predecessor, Mellum. The model is specifically designed for high-quality code generation and excels at a wide range of programming-related tasks.

Mellum2’s MoE architecture allows it to efficiently handle complex coding challenges. By leveraging specialized expert networks, the model can provide more accurate and contextually relevant suggestions for developers.

This release underscores JetBrains’ commitment to empowering developers with advanced AI tools. Mellum2 is expected to enhance productivity and streamline development workflows across various programming languages and environments.

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