can-i-run-this-llm

Can I run this LLM?

Can a Mac Studio M3 Ultra (512GB) run GPT-OSS 20B (MoE)?

GPT-OSS · Apache 2.0 · estimated for a 512.0 GB machine at 4K context.

Yes — it runs great.

Best fit: GPT-OSS 20B (MoE) at FP16 · 13.8 GB · 95–143 tok/s on a Mac Studio M3 Ultra (512GB).

Every quantization on this machine

QuantSizeSpeedFit
Q2_K11.5 GB102–154 tok/sRuns great
Q3_K_M11.5 GB102–153 tok/sRuns great
Q4_K_M11.6 GB102–153 tok/sRuns great
Q5_K_M11.7 GB102–152 tok/sRuns great
Q6_K12.0 GB101–151 tok/sRuns great
Q8_012.1 GB100–151 tok/sRuns great
FP1613.8 GB95–143 tok/sRuns great
Open the full calculator →Everything a Mac Studio M3 Ultra (512GB) runsGPT-OSS 20B (MoE) on other machinesWhat to buy to run it →

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