Full Breakdown
Meta and Apple Enable On-Device Run of Muse Spark Open Model
By Drooid · · How we work
Core Event: Joint Launch of Muse Spark Open on Apple Mac Studio
On October 15, 2026, Meta announced the release of Muse Spark Open, an open-weight AI model designed to run locally on Apple’s Mac Studio desktops with the M5 Ultra chip. Developers can download the weights and execute the system on two (or more) Mac Studios, removing the need for cloud services.
Background & Context
Meta and Apple, once competitors, have begun cooperating after leadership changes—John Ternus as Apple’s hardware chief and Alexandr Wang steering Meta’s AI strategy. Both companies cite months of behind-the-scenes work leading up to the October announcement.
Data & Statistics
- Model size: 816 billion total parameters, 42 billion active parameters, 1 million-token context window.
- Hardware requirement: Two Apple M5 Ultra Mac Studios, each with 512 GB unified memory (?1 TB total).
- Cost: Mac Studio with M5 Ultra and 256 GB memory starts at $10,799; a 512 GB version arrives later this month.
- Availability: Model weights are free on Hugging Face, Amazon SageMaker AI, and Microsoft Foundry Models.
Official Statements & Responses
Meta AI chief Alexandr Wang noted that most open-weight models are too large for typical PCs, but Apple’s memory architecture makes Muse Spark Open practical for desktop use. Apple’s technical blog highlighted the MLX framework, an open-source array library optimized for unified memory, enabling efficient model splitting across machines.
Why It Matters
Running an 816-billion-parameter model locally keeps data on the user’s hardware, enhancing privacy, and lets developers avoid recurring cloud-compute costs. Apple’s silicon gains a high-profile AI workload, challenging Nvidia’s dominance in data-center AI chips. The partnership also signals a shift in Silicon Valley alliances as two historic rivals collaborate on open-source AI amid policy scrutiny of freely available models.
What’s Next
Apple will ship the 512 GB M5 Ultra Mac Studio later this month, expanding hardware options for Muse Spark Open. Meta positions the model as a stepping stone for developers, who may later adopt larger, proprietary models such as Meta’s Muse Wonder. Both companies declined to comment on deeper future collaboration.
Verbatim Quotes
- “Muse Spark Open -- weights releasing today -- runs great on new Mac Studios thanks to work with @johnternus and Apple,” — Meta CEO Mark Zuckerberg
- “We worked with Apple to bring leading Agent capabilities to your desktop for the first time on the Apple M5 Ultra Mac Studios, so you know we're really excited about this,” — Alexandr Wang, Meta AI chief
