gpt-oss on Apple M2 Ultra · 192GB

✅ Runs comfortably — gpt-oss 120B-A5.1B (MoE) @ MXFP4
gpt-oss 120B-A5.1B (MoE) at MXFP4 needs ~62.5 GB (weights 59.0 GB + KV 576 MB + overhead 3.0 GB @ 8K ctx) of your 141 GB usable (of 192 GB unified memory) — plenty of headroom. Expect ~50–85 tok/s (very fast).
context @ MXFP4: comfortable to 128K
quantneedsspeed
✓ MXFP462.5 GB~50–85 tok/s (very fast)
$runlocal install gpt-oss:120b
runlocal verdict card
download card share on x share on reddit drop it in your model-drop post
gpt-oss: Runs comfortably
for your own README — links back here

Same model, other machines: Apple M1 · Apple M1 Pro · Apple M2 · Apple M3 Pro · Apple M2 Pro · Apple M4 Pro

Also runs on a Apple M2 Ultra: DeepSeek-R1 (distill) · Qwen3 · Qwen2.5 · Llama 3.1 · Llama 3.3

Best models for a Apple M2 Ultra · 192GB →

Architecturally similar

These share gpt-oss's KV-cache geometry — they size memory the same way, so here's how they fit on a Apple M2 Ultra · 192GB too:

modelsharesverdict here
Llama 3.2 8kv/64hd ✅ Runs comfortably

Check any combo yourself: open the checker →