> Genie 4 is Google DeepMind’s first real-time world model with native audio, generating ambient sound, music and live dialogue from characters who react to users and in-world events.

> Users can rewrite a running simulation by typing, changing weather, moving the camera or adding people, while Gemini fits each edit to the scene and keeps it coherent.

> Gemini 3.8 Flash acts as an in-loop director, splitting goals into steps and checking incoming frames, and Gemini 4 Argon used that loop to simulate Apptronik’s Apollo humanoid playing checkers.

> access starts with trusted testers before Google AI Ultra subscribers and early Gemini API partners. https://x.com/sundarpichai/status/2115115252690145519/video/1