M3 Ultra (512 GB) — benchmark record

M3 Ultra (512 GB) local LLM benchmarks on Apple Silicon Mac with 7 published rows across 3 models. Peak published speed is 43.0 tok/s on Devstral Small 1.1. Largest published fit uses 415.4 GB. Published runtimes include LM Studio, MLX. Evidence state and next-step ranking links included.

7Benchmark rows

3Models tested

43.0Fastest avg tok/s (Devstral Small 1.1)

0Silicon Score Lab rows

What this page answers best

Best published speed here is 43.0 tok/s on Devstral Small 1.1 at 4bit. Largest published memory footprint is GLM-5 at 4bit, using 415.4 GB. Longest published context on this page is 33k. This page is evidence, not the full buying answer.

Evidence state: 7 linked reference rows and no Silicon Score Lab rows yet.

Published runtimes here: LM Studio, MLX.

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Current published coverage

Published model coverage includes Devstral Small 1.1, Qwen3.5-397B-A17B, GLM-5. Published runtime coverage on this chip includes LM Studio, MLX. Fastest published row is 43.0 tok/s on Devstral Small 1.1 at 4bit. Largest published footprint on this page is 415.4 GB for GLM-5. Longest published context is 33k.

Devstral Small 1.1 Qwen3.5-397B-A17B GLM-5

Other published M3 Ultra variants: 256 GB

This chip is part of a family. Compare all M3 Ultra RAM variants →

Raw benchmark rows for M3 Ultra (512 GB)

Rows sorted by avg tok/s descending. Click source badge to see original measurement page.

Model	Quant	RAM req.	Context	Avg tok/s	Prompt tok/s	Runtime	Source
Devstral Small 1.1	4bit	—	—	43.0 tok/s	—	LM Studio	ref
Qwen3.5-397B-A17B	q4.1bit	—	—	40.2 tok/s	—	MLX	ref
GLM-5	4bit	391.8 GB	1k	16.7 tok/s	187.0 tok/s	MLX	ref
GLM-5	4bit	394.1 GB	4k	13.7 tok/s	180.1 tok/s	MLX	ref
GLM-5	4bit	396.7 GB	8k	13.2 tok/s	154.1 tok/s	MLX	ref
GLM-5	4bit	402.7 GB	16k	12.0 tok/s	117.4 tok/s	MLX	ref
GLM-5	4bit	415.4 GB	33k	10.7 tok/s	77.7 tok/s	MLX	ref

Models tested on this chip

Devstral Small 1.1 Qwen3.5-397B-A17B GLM-5

Next step

Use Rankings when you need the best overall answer for a Mac, and keep this page open when you need the evidence behind that recommendation.

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Data

benchmarks.json — full dataset · chips.json — chip summaries · benchmarks.csv — CSV export

Data sourced from Silicon Score Lab measurements and community reference runs. See all chip families →