OpenAI says it plans to acquire Promptfoo, a platform designed to help companies test and secure AI systems before they are deployed into production environments. Once the deal closes, Promptfoo’s technology will be folded into OpenAI Frontier, the company’s platform for building and managing what it calls AI coworkers.
The timing makes sense. As businesses rush to deploy AI agents into real workflows, security questions are starting to pile up. It is one thing to experiment with a chatbot in a sandbox. It is another thing entirely to let an AI system interact with company data, internal tools, and customer information.
That is where Promptfoo comes in.
The company builds tools that help developers evaluate how AI systems behave under different conditions. Its platform can test for vulnerabilities such as prompt injection attacks, jailbreak attempts, data leaks, and other situations where an AI agent might behave in ways its creators never intended.
According to OpenAI, Promptfoo is already used by more than 25 percent of Fortune 500 companies. The project is also known in the developer community for its open source CLI and library that allow teams to red team and evaluate LLM-powered applications.
Srinivas Narayanan, CTO of B2B Applications at OpenAI, said the acquisition will strengthen the company’s enterprise AI stack.
“Promptfoo brings deep engineering expertise in evaluating, securing, and testing AI systems at enterprise scale. Their work helps businesses deploy secure and reliable AI applications, and we’re excited to bring these capabilities directly into Frontier.”
If everything moves forward as planned, OpenAI says Promptfoo’s capabilities will become built directly into Frontier. The platform will gain automated security testing tools designed to help enterprises identify risks like prompt injections, jailbreak attempts, data leaks, tool misuse, and other agent behaviors that could cause trouble.
Security and evaluation will also be integrated into development workflows so companies can catch problems earlier, instead of discovering them after an AI system is already deployed.
Another piece of the puzzle is governance. As AI adoption spreads, organizations are facing growing pressure to document how their systems are tested and monitored. OpenAI says Frontier will provide built in reporting and traceability features so companies can keep records of testing activity and track changes over time.
Promptfoo co founder and CEO Ian Webster says the move will help the team scale its mission.
“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.”
One detail that will likely matter to developers is that the open source Promptfoo project is expected to continue. The CLI and evaluation tools have already become popular among engineers who want a straightforward way to test prompts and AI behavior.
OpenAI did not disclose the financial terms of the deal. The acquisition is expected to close once the usual regulatory and contractual conditions are satisfied.
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