What is Muse Wonder, formerly known as 'Watermelon'. Muse Wonder, formerly known as 'Watermelon', is a family of frontier AI models launched by Meta, which described them as its "most capable" models. Designed for personal and professional agentic tasks, they can operate browsers, desktop and mobile apps to complete real-world tasks. They also feature 'Active Memory' and 'Active Focus' to retain user data and stay focused on tasks.