the new interactive world model generates music, ambient sound, and interactive character dialogue natively alongside the simulation, simulates aerodynamics and collisions, and lets users reshape a scene mid-run in natural language, while a Gemini model acts as a guiding agent in the loop — observing frames, breaking goals into steps, and verifying each step. It is a research preview only: rolling out to trusted testers, then Google AI Ultra subscribers in Project Genie and early-access Gemini API / AI Studio partners; DeepMind notes object permanence and long-session coherence still drift.