Patronus AI, which builds evaluation and testing infrastructure for AI agents, announced a $50 million Series B round in June 2026. The round was led by GreenfieldVC (formerly TPG Capital), with participation from Lightspeed Venture Partners and Notable Capital. Added to its earlier $3 million Seed and $17 million Series A, the company's total funding now stands at roughly $70 million. Patronus says it will use the capital to build infrastructure that stress-tests and simulates AI agents in "digital worlds" before deploying them into real-world workflows.
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