OpenAI on Apple M4
Can I run gpt-oss 120B-A5.1B on an Mac Mini M4 Pro 48GB?
Not at Q4_K_M — it needs 67.1 GB against 36.0 GB available. You would need 2 of these cards.
Won't fit
67.1 GB of 36.0 GB · 186%070 GB
Weights
66.0 GB
KV cache
0.6 GB
Runtime overhead
0.5 GB
Over the limit
31.1 GB
Short by 31.1 GB. You can run it with 19 of 36 layers on the Mac Mini M4 Pro 48GB and the rest in system RAM, at roughly 20.4 tok/s — usable for batch work, painful for chat. A smaller quantisation or a shorter context is usually the better trade.
Generation20.4tok/s
Prompt processing700tok/s
Max context0tokens
KV per 1K tokens0GB
Every quantisation of gpt-oss 120B-A5.1B on a Mac Mini M4 Pro 48GB
Highlighted row is the highest quality that still fits at 8K context.
| Quantisation | bpw | Weights | Total | Verdict | Max ctx | tok/s |
|---|---|---|---|---|---|---|
| FP16 / BF16 | 16.00 | 217.6 GB | 218.6 GB | Won't fit | — | 4.64 |
| INT8 / W8A8 | 8.50 | 115.3 GB | 116.4 GB | Won't fit | — | 9.54 |
| FP8 (E4M3) | 8.00 | 108.8 GB | 109.8 GB | Won't fit | — | 10.3 |
| Q6_K | 6.56 | 89.2 GB | 90.3 GB | Won't fit | — | 13.4 |
| Q5_K_M | 5.67 | 77.1 GB | 78.2 GB | Won't fit | — | 16.2 |
| Q5_K_S | 5.52 | 75.1 GB | 76.1 GB | Won't fit | — | 16.6 |
| Q4_K_M | 4.85 | 66.0 GB | 67.1 GB | Won't fit | — | 20.4 |
| Q4_K_S | 4.58 | 62.4 GB | 63.5 GB | Won't fit | — | 22.2 |
| Q4_0 | 4.55 | 62.0 GB | 63.1 GB | Won't fit | — | 22.3 |
| AWQ 4-bit | 4.25 | 59.4 GB | 60.4 GB | Won't fit | — | 23.9 |
| GPTQ 4-bit | 4.25 | 59.4 GB | 60.4 GB | Won't fit | — | 23.9 |
| MXFP4 | 4.25 | 59.4 GB | 60.4 GB | Won't fit | — | 23.9 |
| IQ4_XS | 4.25 | 58.0 GB | 59.0 GB | Won't fit | — | 24.4 |
| Q3_K_M | 3.91 | 53.4 GB | 54.4 GB | Won't fit | — | 28.1 |
| IQ3_M | 3.70 | 50.6 GB | 51.6 GB | Won't fit | — | 30.6 |
| IQ3_XXS | 3.06 | 41.9 GB | 43.0 GB | Won't fit | — | 43.9 |
| Q2_K | 2.63 | 36.1 GB | 37.2 GB | Won't fit | — | 63.8 |
| IQ2_XXS | 2.06 | 28.5 GB | 29.5 GB | Runs comfortably | 100K | 86.0 |
| IQ1_M | 1.75 | 24.3 GB | 25.4 GB | Runs comfortably | 128K | 96.0 |