Flexibility is a free and easy-to-try super-assistant that helps users with writing, learning, and programming. It utilizes the GPT-4o model to simplify learning and work. The product offers a basic free service, including unlimited messages, interactions, and history, along with access to the GPT-3.5 model. Additionally, there's a paid Plus service that includes access to the GPT-4 model, browsing, creating, and using GPTs, as well as extra tools like ALRO, Claude 3, browsing, and advanced data analysis.