OpenAI to Acquire AI Security Startup Promptfoo to Expand Agent Testing
The deal reflects growing demand for tools that test and secure AI agents used in business systems.
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OpenAI plans to acquire Promptfoo, an AI security startup that develops tools for testing and identifying vulnerabilities in AI systems during development, as the company moves to strengthen safeguards around AI agents used in enterprise workflows.
Once the acquisition closes, Promptfoo’s technology will be integrated into Frontier, OpenAI’s enterprise platform for building and operating AI agents across corporate applications and data systems.
The move comes as companies increasingly deploy AI agents to automate tasks across internal software, raising concerns around security, governance, and reliability.
Organizations using such systems need structured ways to test how agents behave, detect risks before deployment, and maintain audit trails for compliance and oversight.
Promptfoo, founded by Ian Webster and Michael D’Angelo, provides tools for evaluating and “red-teaming” large language model (LLM) applications.
Its platform is used by more than 25% of Fortune 500 companies, and it also maintains a widely used open-source command-line interface and library for testing AI applications.
OpenAI said the open-source Promptfoo project will continue to be developed even as enterprise capabilities are integrated into Frontier.
“Promptfoo brings deep engineering expertise in evaluating, securing, and testing AI systems at enterprise scale,” said Srinivas Narayanan, CTO of B2B Applications, OpenAI. “Their work helps businesses deploy secure and reliable AI applications, and we’re excited to bring these capabilities directly into Frontier.”
The integration will focus on embedding security testing directly into the AI development lifecycle. OpenAI plans to add automated red-teaming and security checks into Frontier to help enterprises detect issues such as prompt injections, jailbreaks, data leaks, tool misuse, and policy-violating agent behavior before deployment.
The platform will also introduce deeper workflow integrations to allow developers to identify and fix agent risks earlier in the development process, alongside reporting tools that track changes and document testing to support governance, risk, and compliance requirements.
“We started Promptfoo because developers needed a practical way to secure AI systems,” said Webster. “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 and bring stronger security, safety, and governance capabilities to teams building real-world AI systems.”
OpenAI did not disclose financial terms of the acquisition or a timeline for completing the transaction.
