Meta debuted Muse Spark, its first model from Meta Superintelligence Labs and its first reasoning model, nine months after hiring Alexandr Wang as chief AI officer via a $14.3 billion Scale AI stake deal. The model scores 89.5% on GPQA Diamond and claims efficiency gains of over an order of magnitude less compute than predecessor models, though Meta acknowledged gaps in coding and long-horizon tasks. Unlike the Llama series, Muse Spark is proprietary—rolling out across WhatsApp, Instagram, Facebook, and Ray-Ban glasses with no public open-weight release planned.