**[Opus 5 Writes 5,500 Lines of Code to Create 'The Lord of the Rings' World, Karpathy Says the Era of AI-Generated Games is Coming]** According to monitoring by Beating, Andrej Karpathy handed the opening segment of *The Lord of the Rings* to Opus 5, providing 1 million tokens and a budget of approximately $10, instructing it to create a 3D world using Three.js. The model ran for about 2 hours and produced 5,500 lines of code. It had to arrange various polygonal assets within a three-dimensional coordinate system and write code to animate the entire scene. The final product was somewhat rough, but it successfully transformed text into a playable 3D scene. In the past, few people were willing to create such content due to the high costs and time involved. However, LLMs can continue generating such content, turning highly customized worlds into on-demand creations. Karpathy envisions a future where users can enter these temporarily generated worlds, becoming story characters, spectators, or NPCs—like an on-demand version of *GTA*. The project also exposed some current limitations of LLMs. Opus 5 cannot efficiently or natively watch videos, nor can it enter games for testing; it can only slowly take screenshots at different nodes for inspection. Additionally, it made multiple errors during the process, leaving behind a fair amount of rough and faulty content. While it is already capable of creating a world, it still struggles to seamlessly inspect and experience the world it has built. [Original Link]