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Promptfoo develops open-source tools and automated testing to identify risks in large language model applications.
Founded in 2024 by Ian Webster and Michael D'Angelo, California-based Promptfoo develops tools for testing LLM applications, including automated checks for prompt injection, jailbreaks, and other security, legal, and brand risks. In March 2026, OpenAI agreed to acquire Promptfoo from Andreessen Horowitz and Insight Partners; financial terms were not disclosed. The acquisition is intended to bring its technology into OpenAI Frontier for agent evaluation, risk identification, and oversight.
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