OpenAI announced on Monday that it has acquired cybersecurity startup Promptfoo, a firm that develops tools for testing and securing advanced artificial intelligence systems.

The company, led by Sam Altman, did not reveal the financial details of the acquisition but confirmed that Promptfoo’s team will join OpenAI. Its security tools will be integrated into OpenAI’s Frontier platform designed for AI agents.

“As AI agents become more connected to real data and systems, securing and validating them is more challenging and important than ever,” Promptfoo CEO Ian Webster said in a statement. “Joining OpenAI lets us accelerate this work, bringing stronger security, safety, and governance capabilities to the teams building real-world AI systems.”

OpenAI also said it will continue developing Promptfoo’s widely used open-source project, which allows developers to test different AI prompts and agents and compare the performance of major large language models such as GPT, Claude from Anthropic, and Gemini developed by Google.

OpenAI has stepped up acquisitions and talent hires in recent months as competition intensifies in the AI industry, where it faces rivals such as Anthropic, Google, and Meta Platforms.

In January, OpenAI purchased healthcare technology startup Torch for about $60 million.

The acquisition followed an earlier deal announced in October, when OpenAI bought Software Applications, the developer of an AI interface called Sky designed for Apple Mac users.

It was earlier reported that OpenAI hired Peter Steinberger, the creator of the popular OpenClaw tool widely used by developers to build AI agents.

“He is a genius with a lot of amazing ideas about the future of very smart agents interacting with each other to do very useful things for people,” Altman said in an X post at the time. “We expect this will quickly become core to our product offerings.”