Patronus AI ranks #11 in LLM Observability Evals & Gateways AI search.

Patronus AI is a San Francisco-based AI evaluation and simulation company founded in 2023 by former Meta AI (FAIR) researchers Anand Kannappan (CEO) and Rebecca Qian (CTO). Originally launched as the first automated LLM evaluation and security platform for enterprises, Patronus helps teams detect hallucinations, safety risks, and model failures at scale. Its core evaluation platform includes proprietary evaluation models (Lynx for hallucination detection, GLIDER as a general judge), Patronus Experiments for A/B model testing, production Logs and Traces, and Percival—an AI agent debugger detecting 20+ agentic failure modes. In late 2025 the company expanded into simulation research, introducing Digital World Models, RL Environments, and Generative Simulators to support continuous AI agent improvement. Patronus has raised ~$20M in funding from Notable Capital, Lightspeed Venture Partners, and Datadog.