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JetBrains Unveils Mellum 2

·2026.06.01 22:23

Key point

JetBrains has unveiled Mellum 2 12B, a small MoE model specialized for coding performance.

Details

JetBrains announced Mellum 2 12B, a small MoE (Mixture-of-Experts) model optimized for coding tasks.

The model targets coding capability on par with Qwen 3.5 9B in terms of reasoning performance. However, on general performance metrics outside of coding, it reportedly performs below Qwen 3.5 4B.

The model weights are available via Hugging Face, and detailed technical information can be found in the technical report published on arXiv.

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