Introducing Mellum2: A 12B Mixture-of-Experts Model by JetBrains
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AI & ML interests
Reliable and context-aware coding assistance
Recent Activity
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Papers
Mellum2 Technical Report
The Best of N Worlds: Aligning Reinforcement Learning with Best-of-N Sampling via max@k Optimisation
Articles
Mellum2.1 model weights
Mellum2 GGUF weights
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JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-BF16
Text Generation • 12B • Updated • 102 • 6 -
JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-Q8_0
Text Generation • 12B • Updated • 540 • 23 -
JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-Q6_K
Text Generation • 12B • Updated • 346 • 12 -
JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-Q4_K_M
Text Generation • 12B • Updated • 2.61k • 51
Series of code models by JetBrains
Junie Local's unofficial JetBrains 50/50 blend of Qwen3.6-27B and Qwen3.8-27B: BF16, GGUF, and MLX weights.
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JetBrains/Qwen3.8-3.6-27B-blend
Image-Text-to-Text • 28B • Updated • 1.19k • 34 -
JetBrains/Qwen3.8-3.6-27B-blend-GGUF
Image-Text-to-Text • 27B • Updated • 7.85k • 30 -
JetBrains/Qwen3.8-3.6-27B-blend-MLX-4bit
Image-Text-to-Text • 27B • Updated • 1.23k • 10 -
JetBrains/Qwen3.8-3.6-27B-blend-MTP-MLX-4bit
0.4B • Updated • 1.02k • 8
Mellum2 model weights
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JetBrains/Mellum2-12B-A2.5B-Thinking
Text Generation • 12B • Updated • 2.96k • 344 -
JetBrains/Mellum2-12B-A2.5B-Instruct
Text Generation • 12B • Updated • 14.3k • 88 -
JetBrains/Mellum2-12B-A2.5B-Thinking-SFT
Text Generation • 12B • Updated • 3.98k • 25 -
JetBrains/Mellum2-12B-A2.5B-Instruct-SFT
Text Generation • 12B • Updated • 333 • 14
A collection of datasets, fine-tuned models and benchmarks to train your models for perfect Kotlin code generation.
Mellum2.1 model weights
Junie Local's unofficial JetBrains 50/50 blend of Qwen3.6-27B and Qwen3.8-27B: BF16, GGUF, and MLX weights.
-
JetBrains/Qwen3.8-3.6-27B-blend
Image-Text-to-Text • 28B • Updated • 1.19k • 34 -
JetBrains/Qwen3.8-3.6-27B-blend-GGUF
Image-Text-to-Text • 27B • Updated • 7.85k • 30 -
JetBrains/Qwen3.8-3.6-27B-blend-MLX-4bit
Image-Text-to-Text • 27B • Updated • 1.23k • 10 -
JetBrains/Qwen3.8-3.6-27B-blend-MTP-MLX-4bit
0.4B • Updated • 1.02k • 8
Mellum2 GGUF weights
-
JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-BF16
Text Generation • 12B • Updated • 102 • 6 -
JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-Q8_0
Text Generation • 12B • Updated • 540 • 23 -
JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-Q6_K
Text Generation • 12B • Updated • 346 • 12 -
JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-Q4_K_M
Text Generation • 12B • Updated • 2.61k • 51
Mellum2 model weights
-
JetBrains/Mellum2-12B-A2.5B-Thinking
Text Generation • 12B • Updated • 2.96k • 344 -
JetBrains/Mellum2-12B-A2.5B-Instruct
Text Generation • 12B • Updated • 14.3k • 88 -
JetBrains/Mellum2-12B-A2.5B-Thinking-SFT
Text Generation • 12B • Updated • 3.98k • 25 -
JetBrains/Mellum2-12B-A2.5B-Instruct-SFT
Text Generation • 12B • Updated • 333 • 14
Series of code models by JetBrains
A collection of datasets, fine-tuned models and benchmarks to train your models for perfect Kotlin code generation.