Can AREX-2 27B run on MacBook Pro M3 Pro 18GB?
What this means
AREX-2 27B fits on the MacBook Pro M3 Pro · 18GB at Q2_K. We estimate it uses 13.8GB of the conservative 15GB working budget.
Estimated decode speed is 7.1–9.9 tokens/s. A roughly 300-word answer may take around 47 seconds.
See how fast it feels
Using the midpoint of our 7.1–9.9 tokens/s estimate for this demo.
Where the memory goes
| Component | Detail | GB |
|---|---|---|
| Model weights | Q2_K GGUF (10.6 GB) + mmap overhead | 11.1 |
| KV cache | 4K context window | 1.9 |
| Runtime | macOS inference app + compute buffers | 0.8 |
| Total needed | at Q2_K, 4K context | 13.8 |
| Working budget | 18 GB unified memory − conservative macOS reserve | 15 |
| Headroom | remaining inside the working budget | 1.2 |
Pick your quant
| Quant | Download | Memory | Estimated speed | Verdict |
|---|---|---|---|---|
| Q2_K ★ | 10.6 GB | 13.8 GB | ~7.1–9.9 tok/s | ! Runs, barely |
| Q3_K_M | 13.2 GB | 16.6 GB | — | ✕ Won't fit |
| IQ4_XS | 15.2 GB | 18.7 GB | — | ✕ Won't fit |
| Q4_0 | 16.1 GB | 19.6 GB | — | ✕ Won't fit |
| Q4_K_S | 16.1 GB | 19.6 GB | — | ✕ Won't fit |
| Q4_K_M | 17.2 GB | 20.8 GB | — | ✕ Won't fit |
| Q5_K_M | 20.7 GB | 24.4 GB | — | ✕ Won't fit |
| Q6_K | 23.6 GB | 27.5 GB | — | ✕ Won't fit |
| Q8_0 | 28.7 GB | 32.8 GB | — | ✕ Won't fit |
Use this model for its intended task
AREX-2 27B is designed to iterate on coding and deep-research tasks using tool results and feedback. This Mac has enough working memory for the tracked Q2_K weights, but loading the file in a plain chat window does not supply the inputs, tools, or action loop that make the model useful.
It documents the intended workflow and supported developer runtimes. This is not yet a point-and-click setup for beginners, so do not install LM Studio expecting an ordinary chat tutorial to reproduce the model's task.
Choose Qwen 3.6 27B instead. Its page gives the complete graphical install, download, first prompt, and offline check.
This model is designed to iterate on coding and deep-research tasks using tool results and feedback. Its weights may fit in memory, but it needs a research or coding harness that executes tools and returns feedback between rounds. A normal LM Studio chat does not provide that workflow.
Other models on this Mac
AREX-2 27B on other MacBook Pro M3 Pro configurations
FAQ
Can the MacBook Pro M3 Pro · 18GB run AREX-2 27B?
Yes at Q2_K. We estimate about 13.8GB of working memory and 7.1–9.9 tokens/s at 4K context.
Which AREX-2 27B quant should I use on this Mac?
Q2_K. It is a 10.6GB download and leaves about 1.2GB inside our conservative working budget.
Which app should I use for AREX-2 27B on this Mac?
AREX-2 27B is a task-specific model, not a normal local chat download. The selected weights fit this Mac, but the model still needs its publisher's intended workflow. This page links that repository and recommends Qwen 3.6 27B if you just want local chat.
Are these speeds measured on a MacBook Pro M3 Pro?
No. The range is a formula estimate based on memory bandwidth, model size, active parameters, cooling, and a 4K context. The app, backend, thermals, and prompt can change real performance.