OpenAI acquires Promptfoo, an AI security evaluation platform valued at 6 million, to integrate automated red-teaming into its Frontier enterprise platform.
OpenAI announced this week that it is in the process of acquiring Promptfoo, an AI security and evaluation platform designed to systematically test LLMs and AI agents. Financial terms were not disclosed, but Promptfoo raised more than $23 million and was valued at approximately $86 million following an $18.4 million Series A round in July 2025.
Promptfoo’s 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. The company also provides an open source CLI and library for testing LLM applications, which OpenAI said it will continue to improve post-acquisition.
OpenAI plans to integrate Promptfoo’s capabilities into its Frontier platform, which enterprises use to build and operate AI coworkers. Specifically, OpenAI will use Promptfoo to enhance Frontier with automated security testing and red-teaming capabilities, integration of security into development workflows, and the addition of reporting and traceability features. Srinivas Narayanan, CTO of B2B Applications at OpenAI, said Promptfoo brings deep engineering expertise in evaluating, securing, and testing AI systems at enterprise scale.
Source: SecurityWeek — OpenAI to Acquire AI Security Startup Promptfoo
