# Hugging Face — Introducing Mellum2: A 12B Mixture-of-Experts Model by JetBrains

- Company: Hugging Face (huggingface.co)
- Announced: 2026-06-01T15:45:17+00:00
- Category: open-weight-release
- Subject: Platform
- Open weights: yes
- Models affected: Mellum2
- License: Apache 2.0
- Source: https://huggingface.co/blog/JetBrains/mellum2-launch
- Record: https://forck.live/items/1494-introducing-mellum2-a-12b-mixture-of-experts-model-by-jetbrains

JetBrains releases Mellum2, a 12B-parameter Mixture-of-Experts model trained from scratch on text and code, with 2.5B active parameters per token, under Apache 2.0 license. It is optimized for low-latency inference and targets routing, RAG, sub-agents, and private deployment.

## Evidence

Verbatim from https://huggingface.co/blog/JetBrains/mellum2-launch:

> Mellum2 is a 12B-parameter Mixture-of-Experts model trained from scratch on natural language and code.

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Record: https://forck.live/items/1494-introducing-mellum2-a-12b-mixture-of-experts-model-by-jetbrains
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