Simulation: the new Scaling Law — Joon Sung Park, Simile AI
Simile AI raises $2B to build behavioral foundation models simulating human decision-making at scale
“What if we can just recreate the world that we live in?”— Andrej Karpathy
Simile AI, founded by Joon Sung Park of the landmark Smallville/Generative Agents paper, has raised a $2B Series B backed by Andrej Karpathy and Fei-Fei Li, achieving 85-99% accuracy versus human focus groups for Fortune 100 clients. The company argues simulation is the next scaling law, building post-trained behavioral foundation models on causal mechanisms behind human decisions rather than just prompting frontier LLMs. This positions human-simulation infrastructure as a major new AI product category, with ambitions extending to policy testing, climate change, and UBI modeling.