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Meta launches new Muse Spark Open model, optimized to run on Mac Studio

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Meta launches new Muse Spark Open model, optimized to run on Mac Studio

Meta today unveiled Muse Spark Open, which it says is the “most capable US open-weight model to date.” For Apple users, Meta says Muse Spark Open is optimized to run on the Mac Studio powered by M5 Ultra.

In a blog post, Meta explains that Muse Spark Open is natively multimodal and brings “leading agentic capabilities to your desktop for the first time.”

Today, we’re releasing the weights for Muse Spark Open, the most capable US open-weight model to date. Muse Spark Open is a natively multimodal model with 816B total parameters (42B active) and a 1M-token context window. Built for coding and agentic work, it excels at long-horizon tasks, complex software engineering, and multi-step reasoning.

Meta’s blog post specifically touts that Muse Spark Open leverages Apple’s latest version of MLX. MLX is an open source array framework created by Apple and optimized for the unified memory architecture of Apple silicon.

Using the latest version of MLX, Meta says that Muse Spark Open was optimized for Mac Studio with M5 Ultra, and that “together they’re the best way to run a powerful model on your own desktop.”

Apple’s unified memory architecture lets the M5 Ultra’s integrated GPU use up to 512 GB per Mac Studio, so two machines can hold an entire model. And the chip’s 1.2 TB/s of memory bandwidth is fast enough to read the small slice each token needs. The result is two Mac Studios behave like one supercomputer with a terabyte of unified memory.

We tested a range of agentic workflows running entirely on-device, using Muse Code powered by Muse Spark Open, including shipping real iOS changes to Ice Cubes (an open-source Mastodon client) — bug fixes, new features, full build — and driving DaVinci Resolve end to end, with the model reviewing footage frame by frame to find the strongest moments and crop them vertically.


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