OpenAI acquires a start-up called Promptfoo: What does it do?
What's the story
OpenAI has announced its acquisition of Promptfoo, an artificial intelligence (AI) security start-up. The company was founded in 2024 with the aim of protecting large language models (LLMs) from online threats. The integration of Promptfoo's technology into OpenAI Frontier, the company's enterprise platform for AI agents, is planned after the deal closes.
Security concerns
Addressing security risks in AI agent deployment
The development of independent AI agents has sparked enthusiasm over potential productivity boosts. However, it has also opened new avenues for malicious actors to compromise sensitive information or manipulate automated systems. This acquisition highlights the industry's race to demonstrate that their technology can be safely integrated into critical business operations.
Company profile
Promptfoo's tools used by over 25% of Fortune 500 companies
Founded by Ian Webster and Michael D'Angelo, Promptfoo develops tools for businesses to test LLM security vulnerabilities. The company offers an open-source interface and library, with its products being used by over 25% of Fortune 500 companies. Despite raising only $23 million since its inception, Promptfoo was valued at $86 million after its last funding round in July 2025.
Integration strategy
Enhancing AI safety and reliability at scale
OpenAI has revealed that Promptfoo's technology will enable its agent platform to conduct automated red-teaming, assess agentic workflows for security risks, and monitor activities for potential threats and compliance requirements. The company also plans to continue expanding Promptfoo's open-source offering. This move is part of OpenAI's broader strategy to make enterprise AI not only powerful but also safe and reliable at scale.
Cybersecurity innovation
Broader trend of AI-driven cybersecurity solutions
San Francisco-based Promptfoo is one of many start-ups creating cybersecurity products that leverage AI to defend against hackers. The company offers open-source tools for testing the security of AI systems and helping businesses identify vulnerabilities in their own products through a process called red-teaming.