DeepSeek V4.1 Flash is a 748.49B-parameter mixture-of-experts model (16B active per token). At Q3_K_M it needs about 348.0 GB of memory. The Mac Studio M3 Ultra 512GB has 384 GB usable, so it fits entirely in memory. Expect about 53 tokens/sec (45–61), with the first token after 0.4 s for a short prompt. This estimate is projected from the hardware specs; no benchmarks exist yet.
| Quantization | File size | Memory | Generation | First token | Source |
|---|---|---|---|---|---|
| Q2_K | 264.5 GB | Fits | 70 tok/s | 0.4 s | Projected |
| Q3_K_M | 347.3 GB | Fits | 53 tok/s | 0.4 s | Projected |
| 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 M3 Ultra 512GB · 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.