tech
March 9, 2026
The open-source AI red-teaming tool used by Fortune 500 companies is now part of OpenAI
The acquisition of Promptfoo, which counts more than 125,000 developers and 30-plus Fortune 500 companies among its users, is OpenAI’s most direct move yet into AI application security. Its technology will go into Frontier, the company’s enterprise agent platform launched just a month ago.
TL;DR
- OpenAI has acquired Promptfoo, an open-source AI application security testing tool.
- Promptfoo's technology will be integrated into OpenAI's enterprise agent platform, Frontier.
- The acquisition aims to enhance AI agentic security testing and evaluation capabilities within Frontier.
- Promptfoo serves over 125,000 developers and more than 30 Fortune 500 companies.
- The platform acts as an automated adversary to test AI applications for vulnerabilities.
- OpenAI has pledged to keep Promptfoo open source under its current license.
- This move signifies OpenAI's increasing focus on AI application security as AI agents gain wider enterprise adoption.
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