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Can I run petitgpt on a Mac with 32 GB?

Yes

Its published weights (499 MB) fit in the 21.3 GB a Mac with 32 GB can use, with room for an unknown amount of context.

Full analysis of petitgpt Everything that runs on Mac with 32 GB Get the weights on Hugging Face
hf download yqi0/petitgpt

Files and context on Mac with 32 GB

Each file of petitgpt (and of GGUF versions the site has analyzed), and how much context fits next to it, with the context cache in 16-bit or 8-bit.

FileSizeOn Mac with 32 GB Context (16-bit)Context (8-bit)
As published499 MBFitsnot knownnot known
4-bit (estimate)70.1 MBFitsnot knownnot known

petitgpt on other hardware

Popular models that run on Mac with 32 GB

Assumes 67% of the Mac's memory is usable (macOS's default limit for the GPU; it can be raised) and at least 4K tokens of context for one conversation, with the context cache in 16-bit unless noted. Fits leaves at least 20% of that memory for context; Tight leaves less.