Meta Platforms' Muse AI agent (software that performs tasks for users) has reached the No. 1 position among free apps on Apple's U.S. App Store, ahead of ChatGPT. NYU Stern professor and entrepreneur Scott Galloway says Meta's years of data from Facebook, Instagram and WhatsApp could give Muse an advantage over rivals that must build user context from scratch. Muse launched Sept. 8 and can send emails, book travel, shop and perform other tasks across services users choose to connect. Galloway argues Meta may not need the world's highest-ranked AI model if Muse proves more useful in everyday situations. Polymarket traders assign Meta about a 3% chance of having the best AI model at the end of 2026, versus roughly 72% for Anthropic, with more than $1.3 million traded. A reported informal test found Muse booked a restaurant in under a minute, while ChatGPT and Claude failed and Google's Gemini required several confirmations. The approach depends on outside platforms permitting access: Amazon blocked Muse from shopping on its site Sunday night, citing privacy, security and transparency concerns. Meta says Muse cannot access users' passwords or payment details, although reported internal testing found security and reliability problems before launch. Trust remains another constraint, with an Oppenheimer survey showing that 8% of U.S. consumers would trust Meta with passwords, compared with 30% for Google and 16% for ChatGPT. Meta shares were around $711 Monday morning, up roughly 16% since Muse launched.