Can I Run GPT-OSS 20B on Apple M1?

Written by Jakub Rusinowski · Last updated August 15, 2026

Yes. GPT-OSS 20B needs 10.6 GB at MXFP4 and the Apple M1 has 16 GB, leaving about 5.4 GB of headroom, at roughly 3 tok/s (estimated) with room for up to 64K of context.

The numbers

ModelGPT-OSS 20B
Parameters20B
QuantizationMXFP4
VRAM needed10.6 GB
Apple M1 VRAM16 GB
VerdictRuns
Max context64K
Estimated speed~3 tok/s

What to do next

Nothing to change — run it at MXFP4. If you want more capability, check whether the next size up also fits.

Affiliate disclosure: Some links on this page are affiliate links — if you buy through them, LLM Configurator may earn a commission at no extra cost to you. As an Amazon Associate, LLM Configurator earns from qualifying purchases.

Running GPT-OSS 20B on this card:

Apple Mac mini M1 (16GB)
16 GB VRAM · 20 W board power
2026 prices are volatile — check the current listing.
Check price on Amazon

Buy vs. rent GPT-OSS 20B
Buy the GPU
~$999
Apple M1 · MSRP
Rent by the hour
from $0.34/hr
RTX 4090 (24 GB) class

At 2 hrs/day, buying (~$999) beats renting at $0.34/hr after about 4.1 years.

Affiliate links — we may earn a commission if you sign up, at no extra cost to you.

RunPod $0.34/hr
Rent on RunPod →
Vast.ai $0.35/hr · typical low · varies
Rent on Vast.ai →

Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.

Other GPT-OSS sizes on the Apple M1

GPT-OSS 20B on nearby hardware

All GPT-OSS sizes on the Apple M1 | VRAM calculator for GPT-OSS 20B | Apple M1 GPU page | Check your hardware