Cheapest Mac to run Qwen3.5 397B-A17B
397B parameters (17B active) · quality index 47 · coding 76 · every Apple Silicon Mac ever sold, compared. It is a mixture-of-experts model: all 397B parameters must sit in memory, but only 17B compute per token, which is why it is faster than dense models of similar size.
The cheapest Mac that runs Qwen3.5 397B-A17B comfortably is a used Mac Studio M3 Ultra 32c/80c 512GB (2025) at about $7,457 EST. on the used market — running Q6_K quantization at roughly 31 tok/s with up to 256K tokens of context.
Every Mac that runs it, by used price
| Machine | Used price | Runs at | Est. speed | Max context |
|---|---|---|---|---|
| Mac Studio M3 Ultra 32c/80c 512GB (2025) | $7,457 EST. | Q6_K | 31 tok/s | 256K tokens |
Run it
ollama run qwen3.5:397b pulls the default (≈Q4) build once you have Ollama installed.
Or skip the hardware
Cloud APIs serve Qwen3.5 397B-A17B at about $2.45 per million output tokens. The main site's break-even solver computes the daily usage where owning a Mac becomes cheaper than renting.
Open the interactive guide — speed simulator, TCO, all 75 machines →