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Can I run gemma-4-31B-it on a Mac with 128 GB?

Yes

Its published weights (62.5 GB) fit in the 96.0 GB a Mac with 128 GB can use, with room for ≈ 194K tokens of context.

Full analysis of gemma-4-31B-it Everything that runs on Mac with 128 GB Get the weights on Hugging Face
hf download google/gemma-4-31B-it

Files and context on Mac with 128 GB

Each file of gemma-4-31B-it (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 128 GB Context (16-bit)Context (8-bit)
As published62.5 GBFits194K256K
4-bit (estimate)17.6 GBFits256K256K

gemma-4-31B-it on other hardware

Popular models that run on Mac with 128 GB

Assumes 75% 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.