DeepSeek V4.1 Flash is a 748.49B-parameter mixture-of-experts model (16B active per token). At Q2_K it needs about 265.3 GB of memory. The Mac Studio M5 Ultra 256GB has 192 GB usable, so it doesn't fit, even at its smallest quantization.
| Quantization | File size | Memory | Generation | First token | Source |
|---|---|---|---|---|---|
| Q2_K | 264.5 GB | Doesn't fit | Won't run | — | — |
| Q3_K_M | 347.3 GB | Doesn't fit | Won't run | — | — |
| Q4_K_M | 444.7 GB | Doesn't fit | Won't run | — | — |
| MXFP4 | 507.9 GB | Doesn't fit | Won't run | — | — |
All models on the Mac Studio M5 Ultra 256GB · DeepSeek V4.1 Flash on all hardware
Estimates for a short prompt on a single device. Measured numbers come from community benchmarks (r/LocalLLaMA, localscore.ai and more); others are derived from similar setups or projected from specs. Open source on GitHub.