Patronus AI Raises $50M to Stress-Test AI Agents

Patronus AI has secured $50 million in Series B funding led by Greenfield Partners, with participation from Lightspeed Venture Partners, Notable Capital, Datadog, and Samsung Ventures, bringing total funding to $70 million. The startup, founded by former Meta AI researchers, builds simulated environments to test autonomous AI agents before real-world deployment. Unlike static benchmarks, Patronus AI's world models let developers stress-test agents across unpredictable scenarios using reinforcement learning. The company has grown revenue 15-fold in the past year and counts virtually every major AI lab among its users, with current focus on finance and software engineering applications.