Meta's new Muse will work on your Mac if you do not have two Mac Studios with 512 GB of RAM.
There’s a Muse app for Mac and iOS (and the web) but the actual agent itself and all the models it uses run on Meta’s servers in the cloud.
The new open-weights model that Meta just released called Muse Spark Open, compared to Meta’s current generation of AI stuff, which is simply called “Muse.” Meta says Spark Open has the most capable open-weights model so far (from the US).
However, it’s not a competitor for the frontier closed models such as GPT-6 Astra or Claude Opus 5.5; that would be Muse Wonder and Muse Wonder Full, which are much bigger models that run only in the cloud.
Muse Spark is of the same generation, but it’s a smaller, lightweight, fast-response model made to be comparatively inexpensive. And yes, it will run natively on a Mac! Well, two Macs. But not your Macs.
Apple has a blog post about optimizing Muse Spark Open and two other models to run natively on Apple Silicon Macs. It’s interesting stuff, but it’s worth noting that the other two models (Mistral Medium 3.5 and Qwen 3.8) are the only ones that can run on a single Mac Studio.
Muse Spark Open would require a whopping 1.6 terabytes of RAM in its native precision (BF16) just for the 800+ billion parameters alone. So Apple worked with Meta to optimize and tune it, and if you run it at a quantized 4-bit precision (NVFP4) you can get the memory requirement all the way down to… 493GB.
There’s other overhead involved in actually running it and for macOS itself, so a single Mac Studio with 512GB of RAM can’t run it. I’ll remind you that the 512GB Mac Studio with M5 Ultra is not even out yet, and is expected to cost at least $15,000 and probably quite a bit more.
