The Sam Altman<\/a>-led firm did not disclose the terms of the deal, but said Promptfoo’s team would join OpenAI. Promptfoo’s security tools will be brought within OpenAI’s Frontier platform for AI agents<\/a>.<\/p>\n “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.”<\/p>\n OpenAI said that it would also continue building Promptfoo’s popular open-source<\/a> project that lets developers test various AI-related prompts and agents and compare the performance of large language models like GPT, Anthropic<\/a>‘s Claude<\/a> and Google<\/a>‘s Gemini<\/a>.<\/p>\n OpenAI has been gobbling up startups and tech executives in recent months amid the hyper-competitive AI market in which it competes with companies like Anthropic, Google and Meta<\/a>. <\/p>\n In January, OpenAI acquired<\/a> the health-care tech startup Torch for roughly $60 million, CNBC reported. That deal followed\u00a0OpenAI’s announcement in October that it acquired<\/a> the startup Software Applications, which made an AI-interface dubbed Sky for Apple Mac users.<\/p>\n In February, OpenAI hired Peter Steinberger, who created the popular OpenClaw tool<\/a> that is used by developers to create AI agents.<\/p>\n “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.”<\/p>\n Promptfoo announced<\/a> in July that it had raised a Series A financing round of $18.4 million, which was led by Insight Partners and also included Andreessen Horowitz.<\/p>\n The startup has 11 employees and has raised a total of $22.68 million with a post-valuation of $85.50 million as of July 2025, according to the deal-tracking service Pitchbook.<\/p>\n Andreessen Horowitz has been pushing into the infrastructure and defense markets, and most recently said in January that it raised $15 billion<\/a> as part of its funding efforts related to “American Dynamism.”<\/p>\n From that raise, the venture capital firm said that $6.75 billion will be allocated for a growth fund while two other $1.7 billion funds will focus on apps and infrastructure, respectively.<\/p>\n WATCH: Why OpenAI is reportedly rethinking its shopping plans<\/a>.<\/p>\n
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