Apple and Meta bring Muse Spark Open model to Mac Studio

Meta released its open-weight Muse Spark Open model with 816bn parameters (42bn active), running locally on two Mac Studio desktops with M5 Ultra chips via Apple's MLX framework. It is the first public collaboration between the two rivals since 2017, with Mark Zuckerberg and Apple CEO John Ternus trading posts on X.

• Model has 816bn parameters, 42bn active at a time
• Requires two Mac Studios with M5 Ultra and MLX, up to 512GB memory each
• Mac Studio with M5 Ultra and 256GB costs at least $10,799
• Prompts stay on-device and are not seen by Meta