OpenAI Acquires Promptfoo to Advance AI Agent Security and Safety

OpenAI announced on March 9, 2026, its acquisition of Promptfoo, an AI security platform designed to help enterprises identify and remediate vulnerabilities in AI systems during development. Promptfoo, founded in 2024, offers a widely used open-source CLI and library for evaluating and red-teaming large language model (LLM) applications. Trusted by over 25% of Fortune 500 companies and used by 350,000 developers, the platform focuses on systematic testing for security, safety, and behavioral risks, addressing critical issues like prompt injections, jailbreaks, data leaks, tool misuse, and out-of-policy behaviors.

This move represents a significant step forward in AI safety, particularly for agentic systems. Promptfoo's technology enables rigorous testing of agent behavior, early risk detection, and comprehensive records for oversight, governance, and accountability. By integrating these capabilities directly into OpenAI's Frontier platform—the infrastructure for building and operating AI coworkers—OpenAI aims to embed native security testing, red-teaming, and evaluation into development workflows, along with integrated reporting for traceability and compliance.

Srinivas Narayanan, OpenAI's CTO of B2B Applications, highlighted the value: “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.” Promptfoo co-founder and CEO Ian Webster added, “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.”

The acquisition underscores the growing importance of security in the era of autonomous AI agents, where vulnerabilities can lead to substantial real-world harms. Promptfoo's tools support a wide range of AI providers and models, emphasizing static scanning and evaluations to mitigate risks before deployment. OpenAI plans to maintain Promptfoo as open-source while enhancing it with resources from its model and inference layers.

This development positions OpenAI to lead in secure AI deployment, providing enterprises with foundational tools for trustworthy AI systems. As AI agents proliferate, such integrations are poised to set new standards for safety and reliability in the industry.