OpenAI has announced plans to acquire Promptfoo, an AI security startup known for helping enterprises identify and resolve vulnerabilities in artificial intelligence systems during development, marking a strategic step toward strengthening security and evaluation capabilities for enterprise AI applications. The acquisition will integrate Promptfoo’s technology into OpenAI Frontier, the company’s platform designed to help organizations build and manage AI agents, often referred to as “AI coworkers.” As businesses increasingly deploy AI agents into operational workflows, OpenAI emphasized that evaluation, security, and governance are becoming critical requirements, making it essential for organizations to systematically test AI behavior, detect potential risks before deployment, and maintain documentation that supports oversight and compliance. Promptfoo, led by co-founders Ian Webster and Michael D’Angelo, has developed tools widely used by developers and security teams to evaluate and “red-team” large language model applications, with adoption reported among more than 25% of Fortune 500 companies. Its platform enables organizations to identify vulnerabilities such as prompt injections, jailbreak attempts, data leakage, and unsafe tool usage, allowing teams to test AI systems against adversarial prompts and real-world scenarios before they reach production environments. Following the acquisition, OpenAI plans to embed automated security testing and red-teaming capabilities directly into the Frontier platform, allowing enterprises to detect and mitigate risks earlier in the development lifecycle while maintaining transparency and traceability for governance and compliance requirements. “Promptfoo brings deep engineering expertise in evaluating, securing, and testing AI systems at enterprise scale. Their work helps businesses deploy secure and reliable AI applications, and we’re excited to bring these capabilities directly into Frontier.” Srinivas Narayanan, CTO of B2B Applications, OpenAI.
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The collaboration is also expected to deepen the integration of security evaluation within development workflows, enabling organizations to continuously monitor AI behavior and maintain accountability as AI agents evolve over time. At the same time, Promptfoo’s open-source tools and ecosystem will continue to be supported and developed alongside the enterprise capabilities integrated into OpenAI’s platform. Commenting on the acquisition, Promptfoo leadership highlighted the growing complexity of securing AI agents that interact with real data and systems. “We started Promptfoo because developers needed a practical way to secure AI systems. As AI agents become more connected to real data and systems, securing and validating them is more challenging and important than ever. Joining OpenAI lets us accelerate this work, bringing stronger security, safety, and governance capabilities to the teams building real-world AI systems.” Ian Webster, Co-founder and CEO, Promptfoo. Overall, the acquisition reflects OpenAI’s increasing focus on ensuring the safety, reliability, and governance of enterprise AI deployments as organizations adopt more advanced autonomous agents across business operations.
