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Memory budget · 128 GB

Best local LLMs for 128GB

The Apple M5 Max (128GB) gives about ~96 GB of its 128GB to model weights after the OS takes its share. 118 of 135 local LLMs fit, biggest first.

Usable range
96–96 GB
Models that fit
118
Memory types
1
Top pick
120B

What 128GB actually gives you

Usable figures are sourced per device (tap a card for the full profile). Verdicts below use Q4_K_M, the community-default quant.

Top pick for 128GB Q4_K_M

Runs comfortably on the most capable 128GB setup (Apple M5 Max (128GB), ~96 GB usable) at ~80.3 GB. Check it against your exact device on its model page.

Models ranked for 128GB

Biggest that fits first Mac

Each chip links to the full breakdown for that model on a real 128GB device. "Tight" means it fits but with little headroom, close other apps.

The ceiling, per memory type

Apple M5 Max (128GB) (~96 GB usable)

Runs up to Nemotron 3 Super 120B-A12B (120B) comfortably at Q4_K_M. Larger models either sit tight or spill past the ~96 GB it can give a model.

FAQ

How much of 128GB can a model actually use?

It depends on the memory type. Apple unified memory: about 96 GB (Apple M5 Max (128GB)). The rest is reserved for the OS, display and runtime overhead.

What is the best local LLM for 128GB?

Nemotron 3 Super 120B-A12B (120B) is the strongest model that runs comfortably at Q4_K_M on the most capable 128GB setup (Apple M5 Max (128GB), ~96 GB usable). On a tighter 128GB device the ceiling is lower, shown per row above.

Sources

Memory figures are estimates at Q4_K_M with a small context. See methodology.