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.
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.
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