Compatibility Check
Can I Run GPT-OSS 20B on Apple M1 Ultra?
Yes — Apple M1 Ultra runs GPT-OSS 20B fully on GPU at the FP16 quantization.
Estimated ~20 tokens/sec on the FP16 quantization.
Full GPU
Best variant: FP16
Full GPU inference — 128 GB VRAM meets the 52 GB recommendation.
- GPU VRAM
- 128 GB
- Min VRAM (best fit)
- 46 GB
- Recommended VRAM
- 52 GB
- Estimated tok/s
- ~20
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Every GPT-OSS 20B quantization on Apple M1 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 | 10 GB | 11.5 GB | 13 GB | 8K / 8K | Full GPU | ~64 |
| Q5_K_M | 12.5 GB | 14.4 GB | 16.3 GB | 8K / 8K | Full GPU | ~55.7 |
| Q8_0 | 20 GB | 23 GB | 26 GB | 8K / 8K | Full GPU | ~38.1 |
| FP16Best fit | 40 GB | 46 GB | 52 GB | 8K / 8K | Full GPU | ~20 |
Apple M1 Ultra is solid pick for GPT-OSS 20B
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