OpenAI Acquires AI Security Startup Promptfoo to Bolster Agent Safety

OpenAI Acquires AI Security Startup Promptfoo to Bolster Enterprise AI Agent Safety

On March 9, 2026, leading artificial intelligence research company OpenAI announced its acquisition of Promptfoo, an AI security startup. The move is aimed at significantly enhancing the security capabilities of OpenAI Frontier, its enterprise-grade platform for AI agents.

Founded in 2024, Promptfoo has been developing tools to protect large language models (LLMs) from adversarial online attacks. The company's technology provides automated testing to identify and remediate vulnerabilities in AI systems, including sophisticated attack methods like prompt injections and jailbreaks. Promptfoo reports that its products are already in use by over 25% of Fortune 500 companies, a testament to its technical prowess.

The acquisition will see Promptfoo's advanced security assessment technology integrated into OpenAI Frontier. This will provide enterprise customers with powerful tools to ensure the safety of the AI agents they develop and operate. Specifically, it will enable automated red-teaming, evaluation of agentic workflows for security concerns, and monitoring of activities for risks and compliance needs.

In recent years, the development of independent AI agents that perform digital tasks has generated significant excitement for its potential productivity gains. However, it has also created new opportunities for malicious actors to access sensitive data or manipulate automated systems. This acquisition underscores OpenAI's commitment to addressing these security challenges and represents a significant step toward the safe and responsible deployment of AI technology in critical business operations.

Promptfoo had raised $23 million since its inception and was valued at $86 million after its latest funding round in July 2025. While OpenAI did not disclose the financial terms of the transaction, its strategic importance is considered to be very high. OpenAI has also stated its intention to continue supporting Promptfoo's open-source offerings, signaling a continued commitment to the broader developer community.