OpenAI to acquire AI security platform Promptfoo

OpenAI has announced plans to acquire AI security startup Promptfoo to strengthen testing and evaluation tools for enterprise AI systems, as companies increasingly deploy autonomous AI agents in real-world workflows. The AI startup said Promptfoo’s technology will be integrated into OpenAI Frontier, its platform designed for building and operating “AI coworkers” for enterprises.

The Sam Altman-led firm did not disclose the deal's terms but said Promptfoo’s team would join OpenAI.

OpenAI said that it would also continue building Promptfoo’s popular open-source project that lets developers test various AI-related prompts and agents and compare the performance of large language models like ChatGPT, Anthropic’s Claude and Google’s Gemini.

“As AI agents become more connected to real data and systems, securing and validating them is more challenging and important than ever,” Promptfoo CEO Ian Webster said in a statement. “Joining OpenAI lets us accelerate this work, bringing stronger security, safety, and governance capabilities to the teams building real-world AI systems.”

Promptfoo provides tools that help companies identify vulnerabilities in AI systems during development, including issues such as prompt injections, data leaks and misuse of connected tools.

In January, OpenAI acquired the health-care tech startup Torch for roughly $60 million. That deal followed OpenAI’s October announcement that it acquired the startup Software Applications, which made an AI interface dubbed Sky for Apple Mac users.