# Can I run gpt-oss 120B on Apple M1 (8GB)?

> **No, not enough memory.** Needs ~62.4 GB even at Q4_K_M, but only ~5.5 GB is usable.

Last validated: 2026-06-15.

## Memory math
- gpt-oss 120B: 117B (MoE, 5.1B active); Q4_K_M weighs 59.03 GB on disk.
- At Q4_K_M with a 4k context it needs ~62.4 GB (weights + KV cache + ~0.8 GB runtime overhead, ±15% with context length).
- Apple M1 (8GB): 8 GB unified, ~5.5 GB usable for model weights.
- Headroom: ~-56.9 GB.

## How to run
Recommended quant: n/a. Best tool on macOS: LM Studio.

```sh
ollama run gpt-oss:120b
```

## Run gpt-oss 120B on other devices
- [Apple M4 Max (128GB)](https://localmodel.run/can-i-run/gpt-oss-120b/apple-m4-max-128gb)
- [Apple M5 Max (128GB)](https://localmodel.run/can-i-run/gpt-oss-120b/apple-m5-max-128gb)
- [Apple M3 Ultra (256GB)](https://localmodel.run/can-i-run/gpt-oss-120b/apple-m3-ultra-256gb)

## Other models that run on Apple M1 (8GB)
- [Gemma 3 4B (4B)](https://localmodel.run/can-i-run/gemma-3-4b/apple-m1-8gb)
- [Qwen3 4B (4B)](https://localmodel.run/can-i-run/qwen3-4b/apple-m1-8gb)
- [Phi-3.5-mini 3.8B (3.82B)](https://localmodel.run/can-i-run/phi-3.5-mini/apple-m1-8gb)
- [Phi-4-mini 3.8B (3.8B)](https://localmodel.run/can-i-run/phi-4-mini-3.8b/apple-m1-8gb)
- [Qwen2.5-VL 3B (3.75B)](https://localmodel.run/can-i-run/qwen2.5-vl-3b/apple-m1-8gb)
- [Qwen2.5 3B (3.09B)](https://localmodel.run/can-i-run/qwen2.5-3b/apple-m1-8gb)

Estimate, not a guarantee. 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-m1-8gb