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Can I run Qwen3.8-27B on a Mac with 128 GB?

Yes

Its published weights (55.6 GB) fit in the 96.0 GB a Mac with 128 GB can use, with room for ≈ 256K tokens of context.

Full analysis of Qwen3.8-27B Everything that runs on Mac with 128 GB Get the weights on Hugging Face
hf download Qwen/Qwen3.8-27B

Files and context on Mac with 128 GB

Each file of Qwen3.8-27B (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 published55.6 GBFits256K256K
BF16ggml-org/Qwen3.8-27B-GGUF53.8 GBFits256K256K
Q8_0ggml-org/Qwen3.8-27B-GGUF28.6 GBFits256K256K
Q4_K_Mggml-org/Qwen3.8-27B-GGUF19.0 GBFits256K256K
mtp-Qwen3.8-27B-BF16ggml-org/Qwen3.8-27B-GGUF5.95 GBFits256K256K
IQ4_XSbyteshape/Qwen3.8-27B-GGUF13.1 GBFits256K256K
IQ3_Sbyteshape/Qwen3.8-27B-GGUF11.0 GBFits256K256K
IQ3_XSbyteshape/Qwen3.8-27B-GGUF10.4 GBFits256K256K
IQ3_XXSbyteshape/Qwen3.8-27B-GGUF9.92 GBFits256K256K
IQ2_XXSbyteshape/Qwen3.8-27B-GGUF8.84 GBFits256K256K

Qwen3.8-27B 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.