Mellum2.1
A small, open coding model from JetBrains with 12 billion parameters (2.5 billion active), built to power fast coding agents.
- Made by
- JetBrains
- Released
- Type
- Open weights
- Status
- Live
- How to get it
- Open weights on Hugging Face (Apache 2.0). Built for coding agents and JetBrains tools.
- Good for
- Code completionCoding agentsSelf-hosting
What it is
Mellum is JetBrains’ own coding model family. Mellum2.1 is a mixture-of-experts model with 12 billion parameters, of which 2.5 billion are active at a time, released under the Apache 2.0 licence.
What it means for you
If you code in a JetBrains editor, small specialized models like this keep suggestions fast. Because the weights are open, companies can also run it on their own servers.
Use cases this model is good for
How to automate a boring computer task with an AI-written script (no coding experience needed)
You do the same file-renaming or copy-paste job every week and suspect a small script could do it for you.
Best pick: ClaudeHours saved
