World models are exactly what they sound like—an AI that generates a dynamic environment on the fly. They’re not technically 3D worlds, though. World models like Genie 3 create a video that responds to your control inputs, allowing you to explore the simulation as if it were a real virtual world. Genie 3 was a breakthrough in world models because it could remember details of the world it was creating for a much longer time. But in this context, a “long tim