OpenAI to acquire Promptfoo

Source: OpenAI Blog

OpenAI is acquiring Promptfoo, an AI security platform that helps enterprises identify and remediate vulnerabilities in AI systems during development. Once the acquisition is finalized, the technology will be integrated directly into OpenAI Frontier—the platform for building and operating AI coworkers.

As enterprises deploy AI coworkers into real workflows, evaluation, security, and compliance become foundational requirements. Systematic testing of agent behavior, risk detection before deployment, and clear record‑keeping are essential for oversight, governance, and accountability over time.

The Promptfoo team, led by Ian Webster and Michael D’Angelo, has built a suite of tools trusted by over 25 % of Fortune 500 companies, along with a widely used open‑source CLI and library for evaluating and red‑teaming LLM applications. OpenAI will continue developing the open‑source project while advancing integrated enterprise capabilities within Frontier.

“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

Core Capabilities for Enterprises Building Agents on Frontier

• Security and safety testing built into the platform – Automated security testing and red‑teaming become native features, helping enterprises identify and remediate risks such as prompt injections, jailbreaks, data leaks, tool misuse, and out‑of‑policy agent behaviors.
• Security and evaluation integrated in development workflows – Frontier will embed risk identification, investigation, and remediation directly into the development pipeline, making security a core part of AI system creation and operation.
• Oversight and accountability – Integrated reporting and traceability enable organizations to document testing, monitor changes over time, and meet governance, risk, and compliance expectations for AI.

Leadership Quotes

“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

We’re excited to welcome the Promptfoo team and continue building the tools enterprises need to deploy secure, reliable AI.

The closing of the acquisition is subject to customary closing conditions.