OpenAI Moves to Buy Promptfoo for Frontier Security and Evaluation

On March 9, 2026, OpenAI said on X that it plans to acquire Promptfoo and integrate its technology directly into OpenAI Frontier, the company's platform for building and operating AI coworkers. OpenAI also said Promptfoo will remain open source under its current license and that existing customers will continue to receive service and support.

In the accompanying announcement, OpenAI described Promptfoo as an AI security platform that helps enterprises identify and remediate vulnerabilities in AI systems during development. OpenAI said that as AI coworkers move into real business workflows, enterprises need systematic ways to test agent behavior, detect risks before deployment, and maintain records that support governance, compliance, and long-term accountability.

OpenAI said the Promptfoo team has built a widely used open-source CLI and library for evaluating and red-teaming LLM applications, and that its tools are already trusted by more than 25 percent of Fortune 500 companies. The company outlined three areas it wants to deepen inside Frontier: native security and safety testing, tighter integration of evaluation and remediation into development workflows, and stronger reporting and traceability for oversight.

OpenAI framed the deal as enterprise infrastructure for secure agent deployment rather than a standalone consumer feature. If the acquisition closes, the company expects Frontier customers to get more integrated support for testing prompt injection, jailbreaks, data leaks, tool misuse, and policy compliance in the same workflow they use to build and operate agents. More detail is available in OpenAI's announcement.