Artificial Intelligence OpenAI to Acquire AI Security Startup Promptfoo Promptfoo has raised more than $23 million in funding for a platform that helps developers secure LLMs and AI agents. By Eduard Kovacs | March 11, 2026 (8:25 AM ET) Flipboard Reddit Whatsapp Whatsapp Email OpenAI announced this week that it’s in the process of acquiring AI security company Promptfoo. Financial terms of the acquisition have not been disclosed, but Promptfoo has raised more than $23 million and was reportedly valued at $86 million (based on PitchBook data) following an $18.4 million Series A funding round in July 2025. Promptfoo has developed a security and evaluation platform designed to systematically test LLMs and AI agents. The platform allows developers to simulate a wide array of adversarial attacks — including prompt injections, jailbreaks, and sensitive data leaks — directly within their existing development workflows. Once it completes the acquisition, OpenAI plans to integrate Promptfoo’s capabilities into its Frontier platform, which enterprises use to build and operate AI coworkers. “Promptfoo brings deep engineering expertise in evaluating, securing, and testing AI systems at enterprise scale. Their work helps businesses deploy secure and reliable AI applications, and we’re excited to bring these capabilities directly into Frontier,” said Srinivas Narayanan, CTO of B2B Applications at OpenAI. Advertisement. Scroll to continue reading. Specifically, OpenAI will use Promptfoo to enhance its Frontier platform with automated security testing and red-teaming capabilities, integration of security into development workflows, and the addition of reporting and traceability features. Promptfoo also provides an open source CLI and library for testing LLM applications. OpenAI said it will continue to improve the open source project. SecurityWeek tracked 426 M&A deals in 2025, including 13 involving AI companies, up from eight deals in 2024. Related : Cybersecurity M&A Roundup: 42 Deals Announced in February 2026 Related : Zurich Acquires Beazley in $11 Billion Deal to Lead Cyberinsurance Related : Palo Alto Networks to Acquire Koi in Reported $400 Million Transaction Written By Eduard Kovacs Eduard Kovacs (@EduardKovacs) is senior managing editor at SecurityWeek. He worked as a high school IT teacher before starting a career in journalism in 2011. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering. 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