March 9, 2026

The open-source AI red-teaming tool used by Fortune 500 companies is now part of OpenAI

black Android smartphone and pink case
Amélie Mourichon / Unsplash

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 a...