Models › gpt-oss 20B (MoE) › Apple M4 Pro (48 GB)
Can I run gpt-oss 20B (MoE) on Apple M4 Pro (48 GB)?
Yes
Yes. gpt-oss 20B (MoE) fits fully on the Apple M4 Pro (48 GB) at Q8_0 (about 24.1 GB of 32 GB usable, 8k context). ESTIMATE
Verdict by quantization (8k context, f16 KV, 32 GB RAM for offload)
| Quant | Needs | Apple M4 Pro (48 GB) (48 GB, ~32 GB GPU-usable) |
|---|---|---|
| Q3_K_M | 11.8 GB | ✅ Fits |
| IQ4_XS | 12.5 GB | ✅ Fits |
| Q4_K_M | 14.1 GB | ✅ Fits |
| MXFP4 | 13.5 GB | ✅ Fits |
| Q5_K_M | 16.4 GB | ✅ Fits |
| Q6_K | 18.8 GB | ✅ Fits |
| Q8_0 | 24.1 GB | ✅ Fits |
| F16 | 44.7 GB | ❌ Doesn't fit |
Speed
No measured run for this pair yet, and we don't estimate MoE speeds. Submit a llama-bench run.
Memory figures are estimates from the model's parameter count and config.json (Hugging Face). How we calculate. Last verified with data from 2026-10-20.
FAQ
Can I run gpt-oss 20B (MoE) on the Apple M4 Pro (48 GB)?
Yes. gpt-oss 20B (MoE) fits fully on the Apple M4 Pro (48 GB) at Q8_0 (about 24.1 GB of 32 GB usable, 8k context).
How much VRAM does gpt-oss 20B (MoE) need?
About 14.1 GB at Q4_K_M and 24.1 GB at Q8_0 with 8k context (estimate).
gpt-oss 20B (MoE) on other hardware: RTX 3060 12GB · RTX 4060 Ti 16GB · RTX 3090 · RTX 4090 · RTX 5090 · Apple M4 Max (128 GB)
Other models on Apple M4 Pro (48 GB): Qwen3.6 27B · Qwen3.6 35B A3B (MoE) · Qwen3.8 27B · Gemma 4 31B · Gemma 4 26B A4B (MoE) · Gemma 4 12B · Qwen3.5 9B · Qwen3 Coder 30B A3B (MoE) · GLM 4.7 Flash · Llama 3.1 8B Instruct
See all models for 48 GB VRAM.
Won't fit? Free hosted options: FreeAISwap.