# Can I run gpt-oss 120B on Apple M5 Pro (48GB)?

Updated: 2026-06-15

**No, not enough memory.** Needs ~62.4 GB even at Q4_K_M, but only ~32 GB is usable.

- Model: 117B (MoE, 5.1B active), Q4_K_M 59.03 GB
- Device: 48 GB unified, ~32 GB usable for weights
- Needs ~62.4 GB at Q4_K_M; recommended quant: n/a
- Best tool on macOS: LM Studio
- Command: `ollama run gpt-oss:120b`

Estimate. Method: weights + KV cache + ~0.8GB overhead. Sources: https://ollama.com/library/gpt-oss, https://ollama.com/library/gpt-oss/tags, https://huggingface.co/ggml-org/gpt-oss-120b-GGUF, https://huggingface.co/openai/gpt-oss-120b.

More: https://localmodel.run/can-i-run/gpt-oss-120b/apple-m5-pro-48gb