Patronus AI secures $50M Series B to build digital world models

On June 25, 2026, Patronus AI announced a $50 million Series B funding round led by Greenfield Partners, bringing its total capital raised to $70 million. The San Francisco startup is using the funds to develop large-scale “Digital World Models,” simulated environments that train and evaluate AI agents across complex digital workflows before deployment. The round includes participation from Lightspeed, Notable Capital, Datadog, Samsung and other strategic and financial backers.