Openai Gpt Oss 120B speed on Apple M4 Max and quantization-level VRAM fit.
Apple M4 Max meets the minimum VRAM requirement for Q4 inference of Openai Gpt Oss 120B. Review the quantization breakdown below to see how higher precision settings impact VRAM and throughput.
Apple M4 Max can run Openai Gpt Oss 120B with Q4 quantization. At approximately 15 tokens/second, you can expect Basic speed - best for non-interactive tasks.
You have 68GB headroom, which is sufficient for system overhead and smooth operation.
| Quantization | VRAM needed | VRAM available | Estimated speed | Verdict |
|---|---|---|---|---|
| Q4 | 60GB | 128GB | 14.65 tok/s | ✅ Fits comfortably |
| Q8 | 120GB | 128GB | 10.25 tok/s | ✅ Fits comfortably |
| FP16 | 240GB | 128GB | 5.57 tok/s | ❌ Not recommended |
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Apple M4 Max can run Openai Gpt Oss 120B at Q4 with an estimated 15 tok/s.
Q4 inference is estimated to need about 60GB VRAM on this page, while Apple M4 Max has 128GB available.
If you need more speed or context headroom, compare alternative GPUs below and check higher-tier VRAM options.