Claude Opus 5 builds 3D worlds and sims from one prompt

In hands-on testing, Claude Opus 5 generated walkable 3D galleries, physics sims, and games from single prompts with minimal cleanup. It scored 30.2% on ARC-AGI-3 versus ~2% for Opus 4.8 and GPT-5.6, and matched rival output at half to a fifth of the cost.