Meta’s Muse personal AI agent, launched September 8 as a task-oriented app that connects to email, calendars, payments, and other services via dedicated secure virtual machines, quickly overtook ChatGPT to claim the top U.S. free iPhone spot by mid-September with millions of downloads and 4.9-star ratings. This momentum, reinforced by Meta’s Connect event announcements of expanded integrations, live voice features, Mac support, and a planned December Muse Charm device, positions the app as the clear frontrunner for October 9. ChatGPT and Google Gemini trail due to established but less differentiated capabilities, while lower-odds options like Vinted or Threads reflect limited recent catalysts. Traders see sustained user adoption of Meta’s agentic model as the dominant near-term driver, tempered by the possibility of surprise releases from competitors.