Chinese researchers develop Light Society to simulate 1 billion AI characters

A team of Chinese researchers has built a framework called Light Society that can simulate societies of over one billion AI agents, each equipped with realistic demographic profiles and the ability to exhibit human-like social behaviors. The project, detailed in a paper submitted to arXiv, represents a roughly 100x leap over previous agent-based simulations, which typically hit a wall at around 10 million agents due to computational bottlenecks. How you simulate a billion people The research team spans some of China’s most elite institutions: the University of Science and Technology of China, Tsinghua University, and Fudan University. Lead researchers Haoxiang Guan and Tie-Yan Liu designed Light Society around two core technical innovations that make billion-scale simulation feasible. The first is a mixture-of-models engine, which essentially distributes the cognitive workload across multiple AI model types rather than routing every agent decision through a single massive language model. The second innovation involves knowledge-distilled surrogate models. In plain terms, the system trains smaller, faster models to mimic the behavior of larger, more sophisticated ones. This lets the...