Running NVIDIA Cosmos Locally on Mac: Gets Motion Right, Fails at Counting

MaziyarPanahi · x · 2026-08-08

A developer ran NVIDIA's Cosmos-Reason1-7B model locally on a Mac Studio (M3 Ultra) using MLX 8-bit quantization, combined with Meta SAM 3.1 for segmentation.

He designed an interesting eval: asking the model to predict the next 3 seconds of video, then rolling the actual footage to let the model grade itself. The results show the model accurately predicted the motion trajectory of jets, but hilariously failed at counting (counting 6 objects when there were only 4).

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