Apple M2 Ultra~63 tok/s (Q4)

openai/gpt-oss-20b speed on Apple M2 Ultra

Quantization-specific throughput and VRAM requirements for openai/gpt-oss-20b running on Apple M2 Ultra.

Speed Snapshot

Topline estimate from compatibility data

Modelopenai/gpt-oss-20b

GPUApple M2 Ultra

Q4 speed63 tok/s

Q4 VRAM required10GB

Data Source

Calculation and benchmark status

Speed values come from the compatibility dataset (`estimatedTokensPerSec`) and are sorted by quantization.

For full verdict logic and alternate GPUs, see the canonical compatibility page.

Quantization Speed Table

Quantization	VRAM needed	VRAM available	Speed	Verdict
Q4	10GB	192GB	63 tok/s	✅ Fits
Q8	20GB	192GB	41 tok/s	✅ Fits
FP16	41GB	192GB	23 tok/s	✅ Fits