Qwen 3.5 9B is a 9.65B-parameter model. At Q4_K_M it needs about 6.4 GB of memory. The Mac Studio M5 Ultra 512GB has 384 GB usable, so it fits entirely in memory. Expect about 100 tokens/sec (85–115), with the first token after 0.3 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 |
|---|---|---|---|---|---|
| Q4_K_M | 5.7 GB | Fits | 100 tok/s | 0.3 s | Projected |
| Q8_0 | 9.5 GB | Fits | 59 tok/s | 0.3 s | Projected |
| FP16 | 17.9 GB | Fits | 32 tok/s | 0.3 s | Projected |
All models on the Mac Studio M5 Ultra 512GB · Qwen 3.5 9B 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.