JetBrains
Mellum 2 — open 12B MoE coding models, in Thinking and Instruct flavours.
01What they offer
Mellum 2 is JetBrains’ family of open-source language models built for coding and language tasks. Optimised for low-latency, high-throughput inference, Apache 2.0 licensed, and deployable locally or in the cloud — for coding assistants, RAG apps, code analysis and developer tools.
03Build this with us
If you want to build…
An AI coding assistant
Mellum 2 InstructLow-latency
Reasoning-heavy code tasks
Mellum 2 ThinkingDeeper reasoning
RAG or code-analysis tools
Mellum 2Apache 2.0
04Getting started