Hardware · Apple Silicon

What AI models can the Apple M3 Ultra (512 GB) run?

Unified memory: 512 GB
Usable for models: 384 GB
Memory bandwidth: 819 GB/s
FP16 compute: 28.4 TFLOPS
Released: 2025

macOS lets the GPU use roughly two-thirds to three-quarters of unified memory by default, so we plan around that figure rather than the full 512 GB.

Specifications

Maker	Apple Silicon
Type	Apple silicon (two dies joined)
Chip	Apple M3 Ultra
Unified memory	512 GB
Usable for AI models	384 GB
Memory bandwidth	819 GB/s
FP16 compute	28.4 TFLOPS
Interface	UNIFIED
Released	2025

1 product with the Apple M3 Ultra (512 GB)

Mac Studio (2025) (M4 Max or M3 Ultra)Apple · Desktop · 36, 48, 64, 96, 128, 256 or 512 GB · from $1,999Maker’s page (opens in a new tab)

Best LLMs for the Apple M3 Ultra (512 GB)

Grade · points	Model	Quant	Memory	Speed	Fit
93 ptsExcellent (S) · 93 of 100 points: Model quality 43.0/45, Memory fit 25.0/25, Speed 15.0/15, Memory use 10.8/15	Qwen3.8 Flash Next (125B-A6B)Alibaba	`Q6_K`	179 GB	50.1 tok/s	Runs well
92 ptsExcellent (S) · 92 of 100 points: Model quality 41.6/45, Memory fit 25.0/25, Speed 12.7/15, Memory use 13.3/15	MiMo V2.6 Flash (310B-A15B)Xiaomi	`Q4_K_M`	221 GB	28.9 tok/s	Runs well
92 ptsExcellent (S) · 92 of 100 points: Model quality 40.6/45, Memory fit 25.0/25, Speed 12.0/15, Memory use 15.0/15	Qwen3.5 397B-A17BAlibaba	`Q4_K_M`	278 GB	25.5 tok/s	Runs well
92 ptsExcellent (S) · 92 of 100 points: Model quality 40.2/45, Memory fit 25.0/25, Speed 12.0/15, Memory use 15.0/15	Ornith 1.5 397B-A17BDeepReinforce	`Q4_K_M`	278 GB	25.5 tok/s	Runs well
91 ptsExcellent (S) · 91 of 100 points: Model quality 40.2/45, Memory fit 25.0/25, Speed 13.7/15, Memory use 13.1/15	DeepSeek V4 Flash (284B-A13B)DeepSeek	`Q4_K_M`	217 GB	33.3 tok/s	Runs well
91 ptsExcellent (S) · 91 of 100 points: Model quality 40.8/45, Memory fit 25.0/25, Speed 14.2/15, Memory use 11.8/15	MiniMax M2.7 (230B-A10B)MiniMax	`Q5_K_M`	196 GB	35.8 tok/s	Runs well
91 ptsExcellent (S) · 91 of 100 points: Model quality 40.4/45, Memory fit 25.0/25, Speed 14.2/15, Memory use 11.8/15	MiniMax M2.5 (230B-A10B)MiniMax	`Q5_K_M`	196 GB	35.8 tok/s	Runs well
91 ptsExcellent (S) · 91 of 100 points: Model quality 40.8/45, Memory fit 25.0/25, Speed 11.6/15, Memory use 13.7/15	GLM-5.3 Flash (320B-A18B)Zhipu AI	`Q4_K_M`	227 GB	24.0 tok/s	Runs well
90 ptsExcellent (S) · 90 of 100 points: Model quality 39.7/45, Memory fit 25.0/25, Speed 14.2/15, Memory use 11.8/15	MiniMax M2.1 (230B-A10B)MiniMax	`Q5_K_M`	196 GB	35.8 tok/s	Runs well
90 ptsExcellent (S) · 90 of 100 points: Model quality 39.3/45, Memory fit 25.0/25, Speed 13.7/15, Memory use 12.6/15	DeepSeek V4 Flash (April 2026)DeepSeek	`Q4_K_M`	209 GB	33.3 tok/s	Runs well
90 ptsExcellent (S) · 90 of 100 points: Model quality 40.5/45, Memory fit 25.0/25, Speed 9.9/15, Memory use 15.0/15	MiniMax M3 (427B)MiniMax	`Q4_K_M`	293 GB	17.3 tok/s	Runs well
89 ptsExcellent (S) · 89 of 100 points: Model quality 38.9/45, Memory fit 25.0/25, Speed 12.7/15, Memory use 13.3/15	MiMo V2 Flash (309B-A15B)Xiaomi	`Q4_K_M`	221 GB	28.9 tok/s	Runs well

Best Image models for the Apple M3 Ultra (512 GB)

Grade · points	Model	Precision	Memory	Time per output	Fit
80 ptsGreat (A) · 80 of 100 points: Model quality 37.8/45, Memory fit 25.0/25, Speed 15.0/15, Memory use 2.2/15	FLUX.2 [klein] 9BBlack Forest Labs	`FP16`	37.1 GB	7.6 s	Runs well
78 ptsGreat (A) · 78 of 100 points: Model quality 37.8/45, Memory fit 25.0/25, Speed 14.6/15, Memory use 1.4/15	Z-Image TurboAlibaba (Tongyi)	`FP16`	22.7 GB	11 s	Runs well
78 ptsGreat (A) · 78 of 100 points: Model quality 40.5/45, Memory fit 25.0/25, Speed 3.0/15, Memory use 10.2/15	HunyuanImage 3.0 (80B-A13B)Tencent	`FP16`	170 GB	4.2 min	Runs well
77 ptsGreat (A) · 77 of 100 points: Model quality 41.4/45, Memory fit 25.0/25, Speed 3.8/15, Memory use 7.0/15	FLUX.2 [dev]Black Forest Labs	`FP16`	116 GB	2.5 min	Runs well
76 ptsGreat (A) · 76 of 100 points: Model quality 35.1/45, Memory fit 25.0/25, Speed 15.0/15, Memory use 1.1/15	FLUX.2 [klein] 4BBlack Forest Labs	`FP16`	18.1 GB	4.2 s	Runs well
73 ptsGreat (A) · 73 of 100 points: Model quality 31.5/45, Memory fit 25.0/25, Speed 15.0/15, Memory use 2.2/15	FLUX.1 [schnell]Black Forest Labs	`FP16`	36.4 GB	8.5 s	Runs well

Best Video models for the Apple M3 Ultra (512 GB)

Grade · points	Model	Precision	Memory	Time per output	Fit
73 ptsGreat (A) · 73 of 100 points: Model quality 38.7/45, Memory fit 25.0/25, Speed 4.9/15, Memory use 4.5/15	LTX-2.3Lightricks	`FP16`	75.4 GB	28.2 min	Runs well
71 ptsGood (B) · 71 of 100 points: Model quality 36.9/45, Memory fit 25.0/25, Speed 4.9/15, Memory use 4.5/15	LTX-2 (19B, video + audio)Lightricks	`FP16`	75.4 GB	28.2 min	Runs well
70 ptsGood (B) · 70 of 100 points: Model quality 30.0/45, Memory fit 25.0/25, Speed 13.3/15, Memory use 1.8/15	LTX-Video 13B 0.9.8 (distilled)Lightricks	`FP8`	30.1 GB	3.8 min	Runs well
69 ptsGood (B) · 69 of 100 points: Model quality 38.7/45, Memory fit 25.0/25, Speed 2.4/15, Memory use 3.5/15	Wan 2.2 I2V A14BAlibaba	`FP16`	58.0 GB	1.9 h	Runs well
69 ptsGood (B) · 69 of 100 points: Model quality 38.7/45, Memory fit 25.0/25, Speed 2.4/15, Memory use 3.5/15	Wan 2.2 T2V A14BAlibaba	`FP16`	58.0 GB	1.9 h	Runs well

Best LLMs by task on this hardware Open in Model Finder

Estimates come from published hardware specs and our open formulas, not from running the model on your machine. Real speed varies with runtime, drivers and settings. Numbers marked “Measured” come from a linked benchmark.