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Best free AI models for the Mac Studio M3 Ultra 512 GB
Mac Studio M3 Ultra 512 GB: 512 GB of shared memory (about 384 GB usable by the GPU), 819 GB/s. These are the free models it runs, ranked by Arena votes, with the speed you can expect.
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Voted models that fit fully on the GPU
| Model | Arena score | Size | 4-bit file | Tokens/s |
|---|---|---|---|---|
| GLM-5.3-Flash zai · MoE, 25.4 B active |
1471 | 321.3 B | 196 GB | 33 |
| MiMo-V2.6-Flash xiaomi · MoE, 17.4 B active |
1455 | 310.8 B | 190 GB | 43 |
| nvidia-nemotron-3-ultra-550b-a55b-nvfp4 nvidia · MoE, 55 B active |
1445 | 560.5 B | 341 GB | 17 |
| Gemma 4 31B |
1443 | 31.3 B | 20 GB | 27 |
| Qwen3.8-27B alibaba |
1441 | 27.8 B | 18 GB | 33 |
| GLM-4.6 zai · MoE, 37.6 B active |
1440 | 356.8 B | 217 GB | 21 |
| Hy3 tencent · MoE, 24.4 B active |
1438 | 298.8 B | 182 GB | 30 |
| Qwen3.5-397B-A17B alibaba · MoE, 17 B active |
1438 | 403.4 B | 246 GB | 43 |
| GLM-4.7 zai · MoE, 39.1 B active |
1435 | 358.3 B | 218 GB | 21 |
| Gemma 4 26B A4B google · MoE, 4 B active |
1434 | 25.8 B | 17 GB | 90 |
| MiniMax-M3 minimax · MoE, 26.8 B active |
1433 | 427 B | 260 GB | 30 |
| DeepSeek-V4-Flash (High) deepseek · MoE, 20.4 B active |
1432 | 290.9 B | 177 GB | 37 |
| glm-4.5 zai · MoE, 39.1 B active |
1430 | 358.3 B | 218 GB | 21 |
| MiMo-V2.5 xiaomi · MoE, 17.4 B active |
1428 | 310.8 B | 190 GB | 43 |
| longcat-flash-chat meituan · MoE, 33.4 B active |
1423 | 561.9 B | 342 GB | 26 |
Popular small models
Official small models with no Arena votes yet, ordered by downloads on Hugging Face (popularity, not quality).
| Model | Downloads/month | Size | 4-bit file | Tokens/s |
|---|---|---|---|---|
| Qwen3-0.6B Qwen |
29.5M | 0.8 B | 1.7 GB | 175 |
| Qwen3-4B Qwen |
11.8M | 4 B | 3.6 GB | 109 |
| Qwen3-8B Qwen |
8.9M | 8.2 B | 6.2 GB | 76 |
| Qwen3-14B Qwen |
8.4M | 14.8 B | 10 GB | 51 |
| Qwen3.5-4B Qwen |
7.8M | 4.7 B | 4.0 GB | 119 |
| Qwen3.5-9B Qwen |
7.5M | 9.7 B | 7.1 GB | 76 |
Estimates at 4-bit (Q4_K_M) with an 8K context, calibrated on 44 real llama.cpp tests (typical error about ±10%). Tokens per second: about 10 is reading speed. As an Amazon Associate, FreeLLMArena earns from qualifying purchases; the links do not change the rankings.
Questions
What is the best free AI model for the Mac Studio M3 Ultra 512 GB?
GLM-5.3-Flash (Arena score 1471) is the highest-voted open model that fits entirely in the ~384 GB of shared memory the GPU can use at 4-bit, writing about 33 tokens per second.
How big a model can the Mac Studio M3 Ultra 512 GB run?
About 599 billion parameters for a dense model at 4-bit with an 8K context, fully on the GPU. Mixture-of-experts models can be bigger, and with 64 GB of system RAM larger models still run, more slowly.
Is the Mac Studio M3 Ultra 512 GB good for local LLMs?
It has 512 GB of memory and 819 GB/s of bandwidth. Memory decides which models fit; bandwidth decides how fast they write. With 24 GB or more it runs 27–32 B models, the sweet spot of quality for home use.
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