Mark Zuckerberg announced on X that Muse Spark Open's weights are releasing today. He highlighted that it runs efficiently on new Mac Studios due to collaboration with John Ternus and Apple. John Ternus congratulated the team, emphasizing the impressive performance of such a large model on a personal desk. Ternus also noted the Mac Studio's role in advancing on-device AI capabilities. The text mentions the M5 Ultra Mac Studio with 512 GB RAM is expected by the end of October. It also recalls the ability to cluster multiple Mac Studios via Thunderbolt. The author expresses a preference for Ternus to use only one exclamation mark. The author finds it notable that Zuckerberg posted on X, which he owns, instead of Threads, due to Threads' lack of Apple employees as users. Zuckerberg explained his presence on X by stating that many AI professionals are active there. He also referenced a "1984" spoof by Alexandr Wang, Meta's chief of AI, finding it both funny and regrettable.