Can MacBook Pro M3 Max 128GB run gpt-oss-20b?

Apple · 128 GB LPDDR5 · 400 GB/s bandwidth · OpenAI · 21.5B (active 3.6B) · MoE · model ctx up to 128K

Yes — the MacBook Pro M3 Max 128GB (128 GB LPDDR5) can run gpt-oss-20b. At Q4 with the default 8K context it needs ≈ 13.55 GB VRAM (weights 11.83 GB + KV cache 0.72 GB + 1 GB runtime overhead), which fits within 128 GB. Decode at Q4/8K: ≈ 70.7 tok/s (estimated, batch 1). FP16 (≈ 44.72 GB) also fits, at ≈ 19.4 tok/s (estimated). Estimates come from memory-bandwidth math; rows tagged measured override estimates. Relative ranking is more reliable than absolute tok/s. Methodology.

Fit & speed by quant and context

Quant	Context	VRAM needed	Fits?	tok/s (decode)
Q4	4K	13.19 GB	Yes	70.7 est.
Q4	8K default	13.55 GB	Yes	70.7 est.
Q4	32K	15.71 GB	Yes	70.7 est.
FP16	4K	44.36 GB	Yes	19.4 est.
FP16	8K default	44.72 GB	Yes	19.4 est.
FP16	32K	46.88 GB	Yes	19.4 est.

Fits = weights + KV(ctx) + 1 GB overhead ≤ 95% of VRAM. Measured anchors are context-agnostic; the fit verdict is recomputed per context. A missing tok/s means the model is far beyond this card (offload-only territory).

VRAM breakdown at 8K context

Quant	Weights	KV cache	Overhead	Total needed	MacBook Pro M3 Max 128GB VRAM
Q4	11.83 GB	0.72 GB	1 GB	13.55 GB	128 GB
FP16	43.0 GB	0.72 GB	1 GB	44.72 GB	128 GB

Other GPUs that run gpt-oss-20b

• B200 192GB SXM — ≈1414.1 tok/s Q4 est.
• MI300X 192GB — ≈936.9 tok/s Q4 est.
• H200 141GB SXM5 — ≈848.5 tok/s Q4 est.
• H100 80GB SXM5 — ≈592.2 tok/s Q4 est.
• Gaudi 3 128GB — ≈579.1 tok/s Q4 est.
• A100 80GB SXM4 — ≈360.4 tok/s Q4 est.
• RTX 5090 32GB — ≈282.5 tok/s Q4 measured
• RTX 4090 24GB — ≈225.2 tok/s Q4 measured

All GPUs for gpt-oss-20b →

Other models for the MacBook Pro M3 Max 128GB

• Qwen3-0.6B — ≈318.2 tok/s Q4 est.
• gemma-3-1b-it — ≈254.5 tok/s Q4 est.
• Llama-3.2-1B-Instruct — ≈212.1 tok/s Q4 est.
• Qwen3-1.7B — ≈127.3 tok/s Q4 est.
• Qwen3-30B-A3B — ≈84.8 tok/s Q4 est.
• Qwen3-Coder-30B-A3B-Instruct — ≈84.8 tok/s Q4 est.
• GLM-4.7-Flash — ≈84.8 tok/s Q4 est.
• Qwen3-30B-A3B-Instruct-2507 — ≈84.8 tok/s Q4 est.

All models on the MacBook Pro M3 Max 128GB →