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OpenAI has completed its acquisition of Promptfoo, a startup specializing in AI security and testing, in a move aimed at enhancing the safety of large language models and AI agents as these technologies see growing adoption within enterprises. Financial terms of the deal were not disclosed.

Founded in 2024, Promptfoo focuses on developing advanced tools for testing large language models, identifying potential security vulnerabilities, and analyzing operational risks associated with AI systems. Despite its short history, the company has already built a client base that includes multiple Fortune 500 companies.

The acquisition comes at a time of rapid growth in the independent AI agent market, as organizations increasingly rely on these systems for complex tasks such as data analysis, customer service, and process automation. This expansion has amplified concerns about data security and the potential exploitation of AI systems, which could lead to sensitive information leaks.

Promptfoo employs automated testing mechanisms designed to detect vulnerabilities in AI models before widespread deployment. It also provides open-source tools that allow developers and enterprises to review their software and periodically evaluate security levels. These measures help detect manipulation attempts, including command-injection attacks that could alter system behavior.

OpenAI plans to integrate Promptfoo’s technologies into its developer and enterprise platforms, providing additional layers of protection for AI agent development and deployment. The company will continue supporting Promptfoo’s open-source tools while expanding their enterprise use.

The acquisition reflects a broader trend among major tech companies to invest in AI cybersecurity solutions, as these systems become increasingly central to corporate digital infrastructures. Ensuring AI security is widely seen as a key factor that will influence the pace of enterprise AI adoption in the coming years.

Market data shows that Promptfoo had raised a total of $23 million since its founding and was valued at approximately $86 million by mid-2025, highlighting the rapid growth of startups specializing in AI security amid rising global demand.