OpenAI announced plans to acquire Promptfoo, a startup that helps organisations identify and fix vulnerabilities in AI systems during development.
The deal is expected to integrate Promptfoo’s technology into OpenAI Frontier, the company’s platform for building and managing AI-powered workplace tools.
However, the financial terms of the acquisition were not disclosed.
Strengthening security for enterprise AI systems
Founded by Ian Webster and Michael D’Angelo, Promptfoo develops tools that allow companies to test and evaluate large language model applications.
These tools help detect issues such as prompt injections, data leaks, system misuse, and other security risks before AI systems are deployed.
According to OpenAI, the technology will become a built-in feature of the Frontier platform, enabling enterprises to conduct automated security testing and red-team evaluations as part of their AI development workflows.
This move comes as organisations increasingly rely on AI agents and automated systems to handle real operational tasks, making safety and compliance more critical.
At present, Promptfoo’s software is already widely used by developers and large organisations.
The company says its tools are used by more than 25% of Fortune 500 companies, alongside an open-source command-line interface and library for evaluating AI applications.
Post acquisition, the founders will join OpenAI as part of the acquisition.
OpenAI said it plans to continue supporting Promptfoo’s open-source project while also expanding enterprise-focused capabilities within Frontier.
Building stronger governance and oversight tools
With the integration, OpenAI aims to help organisations test AI agents earlier in the development process and maintain records needed for governance and compliance.
Srinivas Narayanan said Promptfoo’s technology will strengthen OpenAI’s enterprise offerings.
“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,” says Ian Webster, Co-founder and CEO, Promptfoo
