Can Apple M2 Ultra run gpt-oss 120B?
Yes. Measured 79.68 tok/s generation (llama.cpp, MXFP4; source).
Every measured result for gpt-oss 120B on Apple M2 Ultra
| Build | Quant / setup | Engine | tok/s | |
|---|---|---|---|---|
| Mac Studio M2 Ultra 76-core GPU, 192 GB | MXFP4 | llama.cpp | 79.68 | source |
Memory: Apple M2 Ultra has 192 GB. gpt-oss 120B weights are about 65 GB in its native format (OpenAI model card: 117B total, 5.1B active). Arithmetic, not a measurement; long contexts need more. Check other quants in the VRAM calculator.
Speeds are decode (generation) tokens/sec as reported by each source; quant, engine and context differ, so small gaps are noise.
All measured speeds for gpt-oss 120B: best home rig for gpt-oss 120B.
gpt-oss 120B on other hardware: RTX Pro 6000 (Blackwell, 96 GB)
Other models measured on Apple M2 Ultra: gpt-oss 20B
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