Meta and Apple Release 816B Open-Weight Muse Spark Model for Two Mac Studios; Nvidia Adds Nemotron 3.5
Meta released the weights for Muse Spark Open, an 816-billion-parameter multimodal model that Meta says can run on two Apple Mac Studio computers instead of a data center. The model uses a mixture-of-experts design with 42 billion active parameters per token and a 1-million-token context window. Apple's M5 Ultra chip gives each Mac Studio up to 512 GB of unified memory, and the two machines run a 4-bit compressed version through Apple's MLX framework. Meta says the model outperforms other popular open-weight models but trails some Chinese models on certain coding tasks. Alexandr Wang, Meta's chief of AI, called it "the most capable U.S. open-weight model to date." The Muse Model License permits free use for many developers. Weights are on Hugging Face and several cloud platforms, and Together AI, Groq and Fireworks offer hosted APIs. Apple's new CEO, John Ternus, publicly praised the model after Mark Zuckerberg thanked him on X, and the companies coordinated the release.