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JetBrains releases Mellum2, an open-source MoE model for AI infrastructure

By PulseAugur Editorial · [4 sources] ·

JetBrains has released Mellum2, an open-source 12-billion-parameter Mixture-of-Experts model designed for specialized tasks within AI pipelines. Unlike frontier models, Mellum2 is positioned as a "focal model" optimized for speed and efficiency in software engineering workflows, including code generation, debugging, and tool use. Its architecture allows for rapid inference, making it suitable for on-premises deployments in air-gapped or compliance-sensitive environments, offering an alternative to API-dependent models like Claude Code. AI

IMPACT Enables on-premises, high-speed agentic AI workflows where API-locked models are not feasible.

RANK_REASON New model release from a company that is not a frontier AI lab.

Read on MarkTechPost →

AI-generated summary · Google Gemini · from 4 sources. How we write summaries →

JetBrains releases Mellum2, an open-source MoE model for AI infrastructure

COVERAGE [4]

  1. MarkTechPost TIER_1 English(EN) · Asif Razzaq ·

    JetBrains Releases Mellum2: A 12B MoE Model for Fast, Specialized Tasks in Multi-Model AI Pipelines

    <p>JetBrains releases Mellum2 under Apache 2.0 — a 12B MoE model trained on 10.6 trillion tokens for AI workflows.</p> <p>The post <a href="https://www.marktechpost.com/2026/06/02/jetbrains-releases-mellum2-a-12b-moe-model-for-fast-specialized-tasks-in-multi-model-ai-pipelines/">…

  2. dev.to — LLM tag TIER_1 English(EN) · Andrew Kew ·

    JetBrains just open-sourced the missing piece of self-hosted AI pipelines

    <p>JetBrains just open-sourced Mellum2 — a 12B-parameter coding model built for the infrastructure layer of agentic AI systems. It's available under Apache 2.0 from day one, runs entirely on hardware you control, and is explicitly designed for the deployment scenarios where Claud…

  3. dev.to — LLM tag TIER_1 English(EN) · Dave Kurian ·

    JetBrains open-sources Mellum2 to challenge third-party API limitations

    <p>JetBrains’ Mellum2 open source coding model is a real step-change: a 12B-parameter, on-premises AI infrastructure model, shipped open from day one. This isn’t a warmed-over code completion tool — Mellum2’s speed, scope, and native private-deployment break new ground for agenti…

  4. dev.to — LLM tag TIER_1 English(EN) · Dave Kurian ·

    JetBrains open-sources Mellum2 for private, high-speed AI coding infrastructure

    <p>Mellum2 open-source coding model: JetBrains’ fast AI alternative to Claude Code that runs anywhere</p> <p>JetBrains’ Mellum2 open-source coding model lands with the rare combination of both speed and genuine infrastructure freedom—a 12B-parameter Mixture-of-Experts designed fo…

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