Will Kimi-K2.5 fit on a 512GB Mac Studio (M3 Ultra)?

Yes. Kimi-K2.5-3bit (418 GiB) fits in one 512GB M3 Ultra Mac Studio.

moonshotai/Kimi-K2.5: 1,027B parameters. License: other.

MLX weights	Size	On 512GB (~469 GiB GPU limit)
mlx-community/Kimi-K2.5	612.5 GiB	Doesn't fit, 144 GiB over the limit
mlx-community/Kimi-K2.5-3bit	418.5 GiB	Fits, ~50 GiB left for context

Sizes: sum of .safetensors files from the Hugging Face API (Oct 2026). "GPU limit" is iogpu.wired_limit_mb=480000, already set on our Studios. Newer architectures may need a recent mlx-lm or llama.cpp; check before you book around one model.

Run it

uv venv ~/mlx && uv pip install --python ~/mlx/bin/python -U mlx-lm
~/mlx/bin/mlx_lm.chat --model mlx-community/Kimi-K2.5-3bit

Try it on a whole 512GB M3 Ultra Mac Studio

3 days $299 · 7 days $489 · 14 days $779. Bare metal, one renter per machine, mlx-lm and llama.cpp ready.

Check availability & book