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
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 • 100 • 6 -
JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-Q8_0
Text Generation • 12B • Updated • 557 • 23 -
JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-Q6_K
Text Generation • 12B • Updated • 156 • 14 -
JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-Q4_K_M
Text Generation • 12B • Updated • 1.07k • 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 • 1.01k • 43 -
JetBrains/Qwen3.8-3.6-27B-blend-DFlash2
Text Generation • 2B • Updated • 209 • 2 -
JetBrains/Qwen3.8-3.6-27B-blend-GGUF
Image-Text-to-Text • 27B • Updated • 16k • 43 -
JetBrains/Qwen3.8-3.6-27B-blend-MLX-4bit
Image-Text-to-Text • 27B • Updated • 858 • 12
Mellum2 model weights
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JetBrains/Mellum2-12B-A2.5B-Thinking
Text Generation • 12B • Updated • 4.37k • 349 -
JetBrains/Mellum2-12B-A2.5B-Instruct
Text Generation • 12B • Updated • 3.96k • 91 -
JetBrains/Mellum2-12B-A2.5B-Thinking-SFT
Text Generation • 12B • Updated • 545 • 25 -
JetBrains/Mellum2-12B-A2.5B-Instruct-SFT
Text Generation • 12B • Updated • 484 • 15
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 • 1.01k • 43 -
JetBrains/Qwen3.8-3.6-27B-blend-DFlash2
Text Generation • 2B • Updated • 209 • 2 -
JetBrains/Qwen3.8-3.6-27B-blend-GGUF
Image-Text-to-Text • 27B • Updated • 16k • 43 -
JetBrains/Qwen3.8-3.6-27B-blend-MLX-4bit
Image-Text-to-Text • 27B • Updated • 858 • 12
Mellum2 GGUF weights
-
JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-BF16
Text Generation • 12B • Updated • 100 • 6 -
JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-Q8_0
Text Generation • 12B • Updated • 557 • 23 -
JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-Q6_K
Text Generation • 12B • Updated • 156 • 14 -
JetBrains/Mellum2-12B-A2.5B-Thinking-GGUF-Q4_K_M
Text Generation • 12B • Updated • 1.07k • 51
Mellum2 model weights
-
JetBrains/Mellum2-12B-A2.5B-Thinking
Text Generation • 12B • Updated • 4.37k • 349 -
JetBrains/Mellum2-12B-A2.5B-Instruct
Text Generation • 12B • Updated • 3.96k • 91 -
JetBrains/Mellum2-12B-A2.5B-Thinking-SFT
Text Generation • 12B • Updated • 545 • 25 -
JetBrains/Mellum2-12B-A2.5B-Instruct-SFT
Text Generation • 12B • Updated • 484 • 15
Series of code models by JetBrains
A collection of datasets, fine-tuned models and benchmarks to train your models for perfect Kotlin code generation.