CHAI is a consumer platform that lets users build and chat with their own AI characters and stories. The company has grown rapidly, reaching $70M/yr in revenue by 2026, and operates a 1.4 exaflop GPU cluster to serve hundreds of in-house trained LLMs. It focuses on engagement through reinforcement learning and model blending, with features like custom character creation, story building, and a scalable infrastructure supporting over 1M daily active users.