M2 Ultra vs M3 Ultra
Signed, community-submitted decode tok/s, prefill, and TTFT for M2 Ultra vs M3 Ultra — every number links to the run it came from.
Verdict
M2 Ultra has no submitted run yet, so there is no head-to-head number to report. We do have 26 models measured for M3 Ultra (peak 429 tok/s decode on mlx-community/Qwen3-0.6B-4bit) — the table below is that baseline. Run the llm-speed suite on M2 Ultra and this page fills in the second column automatically.
512 GB is the historical maximum announced in 2025. Apple's model-specific support page checked September 7, 2026 lists 96 GB configurable to 256 GB. Check the actual machine: a family ceiling is not installed memory, current availability or a measured configuration. 2025 launch specification · Model-specific specification
View M3 Ultra page →M3 Ultra benchmarks — no shared model with M2 Ultra yet
See also: M2 Ultra benchmarks · M3 Ultra benchmarks · All hardware · All models · Methodology