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gpt-oss-120b-MXFP4-Q8

M3 Ultra (80c) · 512 GB · 4bit · 2026-03-11

Performance

1k

tokens

583.5

PP tok/s

65.4

TG tok/s

1755

TTFT (ms)

59.2

Peak mem (GB)

Hardware

Chip M3 Ultra (80c)

Memory 512 GB

GPU Cores 80

Software

oMLX v0.2.7

macOS macOS 26.3.1

Context 1,024

Performance by Context Length

Context	PP tok/s	TG tok/s	Peak Mem
1k	583.5	65.4	59.2 GB	current
4k	703.2	67.6	59.3 GB	view

Batching Results

Batch Size	TG tok/s	Speedup
1×	65.4	1.00×
2×	108.3	1.66×
4×	145.2	2.22×