Can I run this LLM?
Can a Mac Studio M5 Ultra (256GB) run Qwen3.8 Flash Next (MoE)?
Qwen · See model card · estimated for a 256.0 GB machine at 4K context.
Yes — it runs great.
Best fit: Qwen3.8 Flash Next (MoE) at Q5_K_M · 134.7 GB · 87–131 tok/s on a Mac Studio M5 Ultra (256GB).
Every quantization on this machine
| Quant | Size | Speed | Fit |
|---|---|---|---|
| Q2_K | 80.9 GB | 108–162 tok/s | Runs great |
| Q3_K_M | 92.0 GB | 103–154 tok/s | Runs great |
| Q4_K_M | 119.6 GB | 92–138 tok/s | Runs great |
| Q5_K_M | 134.7 GB | 87–131 tok/s | Runs great |
| Q6_K | 168.1 GB | 78–117 tok/s | Tight / slow |
| Q8_0 | 188.3 GB | 73–110 tok/s | Won't fit |
| FP16 | 354.0 GB | 49–73 tok/s | Won't fit |
Open the full calculator →Everything a Mac Studio M5 Ultra (256GB) runsQwen3.8 Flash Next (MoE) on other machinesWhat to buy to run it →
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