Meta Launches Proprietary Muse Spark Model from Superintelligence Labs, Replacing Llama Across All Platforms

Meta's Superintelligence Labs, led by Alexandr Wang, released Muse Spark — the company's first major proprietary AI model in approximately a year — now powering the Meta AI app and website in the US. The model will replace existing Llama models on WhatsApp, Instagram, Facebook, Messenger, and Meta's smart glasses in coming weeks, and is designed to be small, fast, and capable of complex reasoning in science, math, and health. Independent evaluations show Muse Spark competitive with top models in language and visual understanding but lagging in coding and abstract reasoning, tying for fourth on Artificial Analysis's benchmark index. Critically, Muse Spark ships as a closed hosted model rather than open weights, prompting scrutiny from developers who built on Llama infrastructure about Meta's long-term open-source commitment.