Compatibility Check
Can I Run GPT-OSS 120B on Apple M4 Ultra?
Yes — Apple M4 Ultra runs GPT-OSS 120B fully on GPU at the Q8_0 quantization.
Estimated ~8.7 tokens/sec on the Q8_0 quantization.
Full GPU
Best variant: Q8_0
Full GPU inference — 256 GB VRAM meets the 156 GB recommendation.
- GPU VRAM
- 256 GB
- Min VRAM (best fit)
- 138 GB
- Recommended VRAM
- 156 GB
- Estimated tok/s
- ~8.7
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Every GPT-OSS 120B quantization on Apple M4 Ultra
Each row runs the compatibility engine against your VRAM, RAM, and the model's requirements.
| Quantization | File Size | Min VRAM | Rec VRAM | Context | Verdict | Estimated tok/s |
|---|---|---|---|---|---|---|
| Q4_K_M | 60 GB | 69 GB | 78 GB | 8K / 8K | Full GPU | ~14.6 |
| Q5_K_M | 75 GB | 86.3 GB | 97.5 GB | 8K / 8K | Full GPU | ~12.7 |
| Q8_0Best fit | 120 GB | 138 GB | 156 GB | 8K / 8K | Full GPU | ~8.7 |
| FP16 | 240 GB | 276 GB | 312 GB | 8K / 8K | Can't Run | — |
Apple M4 Ultra is solid pick for GPT-OSS 120B
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