JetBrains/Mellum2.1-12B-A2.5B-Thinking
archivedmodel
Mellum2.1 is the next version of Mellum2 Thinking. Mixture-of-experts, 12B total, 2.5B active (64 experts, 8 per token). Context: 128K tokens (config). License: apache-2.0.
- Org
- JetBrains
- Released
- 2026-09-20
- Status
- archived
- License
- apache-2.0 (permissive)
- Parameters
- 12.1B total, 2.5B active
- Architecture
- MoE · 64 experts, 8/token · MellumForCausalLM
- Context
- 131,072 tokens
- Task
- text-generation · text
- Signal
- 168 HF likes · 3993 downloads
- Archived
- 2026-10-20 (aged out (older than 30 days); stats as last seen)
Runs on
real quant files; need = weights + FP16 KV cache for 8K tokens + 1GB. A sizing calculation, not tested.
- Q4 ~9.6 GB: 12GB GPU (RTX 3060), Mac 16GB
- Q8 ~14.4 GB: 16GB GPU (5060 Ti / 4060 Ti / 4080 / 5080), 24GB GPU (3090 / 4090), 16GB GPU (7800 XT / 9070 XT), 24GB GPU (7900 XTX), Arc B60 24GB, Mac 24GB
- FP16 ~25.8 GB: 32GB GPU (5090), 48GB GPU (RTX 6000 Ada / A6000), 96GB GPU (RTX Pro 6000 Blackwell), 1× DGX Spark (128GB), 2× DGX Spark (256GB), Strix Halo 128GB unified (~96GB usable), Arc B70 32GB, Mac 36GB, Mac 48GB, Mac 64GB (M1 Max), Mac 96GB, Mac 128GB, Mac 192GB, Mac 256GB, Mac 512GB, CPU only, 32GB RAM (slow), CPU only, 64GB RAM (slow), CPU only, 128GB RAM (slow), CPU only, 256GB RAM (slow)
Links
- Hugging Face
- GGUF: JetBrains/Mellum2.1-12B-A2.5B-Thinking-GGUF
- GGUF: bartowski/Mellum2.1-12B-A2.5B-Thinking-GGUF
- MLX: mlx-community/Mellum2.1-12B-A2.5B-Thinking-6bit
First published here 2026-09-20 · updated 2026-10-20 · markdown · JSON