The acquisition will see Promptfoo’s founders Ian Webster and Michael D’Angelo join OpenAI to lead the integration of their automated red-teaming and security evaluation capabilities into OpenAI’s Frontier enterprise platform. According to the Promptfoo team’s announcement, the integration will occur at “the model and infrastructure layers,” enabling teams to build secure applications from the start.
The move reflects growing pressure on AI companies to address security vulnerabilities as enterprises deploy increasingly sophisticated AI agents. By embedding Promptfoo’s technology directly into its platform, OpenAI aims to provide developers with tools to identify and mitigate risks during the earliest stages of development, rather than after deployment.
Rapid Growth and Industry Adoption
Founded just two years ago in 2024, Promptfoo has quickly become a critical player in AI security. The company raised $23 million from investors including Insight Partners and Andreessen Horowitz, achieving an $86 million valuation in its July 2025 funding round, according to TechCrunch.
The startup’s platform provides comprehensive tools for testing, evaluating, and securing AI applications. Its open-source offerings have gained significant traction, with adoption by more than 25% of Fortune 500 companies, The Next Web reported.
Promptfoo has assured existing users and customers of uninterrupted service following the acquisition. Crucially, the company committed to maintaining its open-source suite as a “best-in-class tool for red-teaming, static scanning, and evaluation for any AI model or application,” preserving its model-agnostic approach that has attracted widespread developer adoption.
Market Implications
The acquisition signals a broader trend toward vertical integration of security capabilities within major AI platforms. As enterprises increasingly demand built-in safety measures for AI deployment, independent security vendors may face intensified competition from integrated solutions.
The Promptfoo team stated that joining OpenAI will provide “greater resources and access to cutting-edge research,” accelerating their mission of “helping everyone ship secure, reliable AI.” The deal remains subject to customary closing conditions, with regulatory reviews not yet initiated.
