This is the first video world model that can reliably control multiple independent agents in the same scene—a critical capability for simulating multi-player games and complex interactive environments.
ActionParty is a video diffusion model that can control multiple characters simultaneously in interactive game environments. Unlike existing models limited to single agents, it uses special 'subject state tokens' to track each character's state separately, allowing precise control of up to seven players at once while maintaining their identity and following their assigned actions correctly.