OpenAI acquires Promptfoo to secure its AI agents

In a significant move to bolster its AI security measures, OpenAI announced its acquisition of Promptfoo, an emerging startup specializing in safeguarding large language models (LLMs) from potential online threats. Founded in 2024, Promptfoo has developed innovative tools aimed at identifying security weaknesses in LLMs, which have become increasingly vital as independent AI agents take on digital tasks. The integration of Promptfoo's technology into OpenAI Frontier, the enterprise platform for AI agents, is set to enhance the platform's security capabilities. OpenAI highlighted the importance of this acquisition in addressing the growing concerns surrounding the misuse of AI technology, as cybercriminals attempt to exploit vulnerabilities to access sensitive information or disrupt automated systems. Founded by Ian Webster and Michael D’Angelo, Promptfoo has made a notable impact, with its solutions being utilized by over 25% of Fortune 500 companies. Despite raising $23 million since its inception, the startup achieved a valuation of $86 million following its latest funding round in July 2025, as reported by Pitchbook. While the financial details of the acquisition remain undisclosed, it emphasizes the urgency for tech companies to demonstrate their commitment to safe and reliable AI usage in business operations. OpenAI's announcement indicated that Promptfoo's offerings would enable automated red-teaming, assess workflows for security vulnerabilities, and ensure compliance through diligent monitoring. Furthermore, OpenAI plans to expand Promptfoo's open-source initiatives, reinforcing its commitment to transparency and collaboration in AI development.