OpenAI Group PBC today announced plans to acquire the testing and security assessment platform of artificial intelligence application startup Promptfoo Inc. for an undisclosed price.
Founded in 2024, Promptfoo began as an open-source framework for evaluating AI prompts and model behavior. It has since been expanded into a commercial platform used by developers and enterprise security teams to evaluate and test applications built on large-scale language models and other generative AI systems.
The company’s platform addresses the risks associated with deploying AI models into production. These include prompt injection, data leakage, jailbreak attacks, and running insecure tools. This is done through an underlying architecture that allows developers and security teams to systematically evaluate how AI systems respond to structured input, adversarial prompts, and real-world usage scenarios.
The technology works through a testing framework that allows teams to define prompts, expected outputs, and evaluation criteria in configuration files. The system runs prompts across one or more language models or AI applications, captures responses, and scores them against predefined rules or automated scoring.
The framework supports integration with popular development tools and application programming interfaces, allowing evaluations to be performed locally, in a continuous integration pipeline, or as part of an automated deployment workflow. Core features include prompted testing, red team simulation, and evaluation dashboards that document model behavior under various conditions. The system also supports regression testing, allowing organizations to compare output between model versions and make configuration changes to identify differences in behavior before software updates are released.
The platform is currently being used in environments where organizations are building or operating AI-powered applications such as chatbots, agent frameworks, and automated decision-making tools. OpenAI plans to integrate Promptfoo’s technology directly into OpenAI Frontier, a platform for building and operating AI coworkers. Promptfoo’s technology is also used by OpenAI to enable enterprises to test agent behavior, detect risks before deployment, and maintain clear records to support long-term monitoring, governance, and accountability.
“Promptfoo brings deep engineering expertise in evaluating, securing, and testing AI systems at enterprise scale,” said Srinivas Narayanan, chief technology officer for B2B applications at OpenAI, in an announcement post. “Their work helps enterprises deploy secure and reliable AI applications, and we are excited to bring these capabilities directly to Frontier.”
Promptfoo raised $23.6 million in funding for the acquisition, including $18.4 million in July. Investors in the company include Insight Partners LP and Andreessen Horowitz.
Image: Prompt Fu
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