OpenAI has announced plans to acquire Promptfoo, an artificial intelligence security platform that helps enterprises identify and address vulnerabilities in AI systems during development. Following the completion of the acquisition, Promptfoo’s technology will be integrated into OpenAI Frontier, the company’s platform designed for building and managing AI-powered “coworkers” within enterprise workflows.

The move comes as businesses increasingly deploy AI agents across operations, making evaluation, security and compliance critical elements of enterprise AI adoption. Organisations are seeking structured approaches to test AI behaviour, detect potential risks before deployment and maintain clear oversight of AI systems over time.

Promptfoo, led by co-founders Ian Webster and Michael D’Angelo, has developed a suite of AI testing and security tools used by more than 25 per cent of Fortune 500 companies. The company also maintains a widely adopted open-source command-line interface (CLI) and library designed to evaluate and “red-team” large language model (LLM) applications.

OpenAI said it plans to continue supporting Promptfoo’s open-source project while expanding enterprise-grade capabilities within the Frontier platform.

According to Srinivas Narayanan, CTO of B2B Applications at OpenAI, Promptfoo brings deep engineering expertise in evaluating and securing AI systems at scale. Integrating these capabilities into Frontier will help enterprises deploy AI applications that are both reliable and secure.

The integration will introduce several key features for organisations developing AI agents on Frontier. These include built-in automated security testing and red-teaming capabilities designed to detect risks such as prompt injections, jailbreaks, data leaks, misuse of tools and other policy violations. Security and evaluation processes will also be embedded directly into development workflows, enabling teams to identify and address risks earlier in the development cycle.

In addition, the platform will provide enhanced oversight and reporting tools to help organisations track system changes, document testing processes and meet growing governance and compliance requirements around AI.

Promptfoo CEO Ian Webster said the company was founded to give developers practical tools to secure AI systems. As AI agents become increasingly connected to enterprise data and infrastructure, validating and safeguarding them has become more complex and essential.

By joining OpenAI, Webster added, Promptfoo aims to accelerate the development of stronger security, safety and governance capabilities for teams building real-world AI systems.