JetBrains open-sources Mellum2, a 12B-parameter coding model for private AI infrastructure
By
Paul Sawers
Fresh out the oven, still warm. Top of the tray.
Summary
JetBrains has open-sourced Mellum2, a 12B-parameter coding model designed for agentic AI infrastructure tasks like routing, retrieval pipelines, and sub-agent operations. Unlike its predecessor Mellum (a 4B-parameter model), Mellum2 is open from day one and focuses on private on-premises deployment, positioning itself as an alternative to cloud-dependent coding tools like Claude Code. The model runs entirely on user infrastructure, challenging tools that rely on third-party APIs.
Key quotes
· 3 pulledJetBrains announced on Monday it has open-sourced Mellum2, a 12B-parameter coding model aimed at the infrastructure layer of agentic AI systems
Mellum2 is open from day one
Mellum2 is fast, open source, and runs entirely on your own infrastructure — a challenge to coding tools that depend on third-party APIs to function
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