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Recruiting the Minds Behind AI Infrastructure

OpenAI has also strengthened its technical bench through high-profile hires.

In February, the company brought on developer Peter Steinberger, creator of the widely used OpenClaw.

Steinberger’s work has been influential in helping developers build AI agents capable of interacting autonomously with digital systems.

Altman praised the developer’s vision in a post on X.

“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 wrote at the time.

Altman added that such capabilities are expected to become central to OpenAI’s product ecosystem.

Startup Backed by Major Investors

Promptfoo had already attracted attention in the venture capital world before the acquisition.

The startup announced in July that it raised $18.4 million in a Series A funding round led by Insight Partners, with participation from venture capital giant Andreessen Horowitz.

According to data from PitchBook, Promptfoo employs 11 people and has raised $22.68 million in total funding, reaching a post-money valuation of $85.5 million as of July 2025.

Andreessen Horowitz has increasingly focused on infrastructure and defense-related technology investments.

In January, the firm announced it had raised $15 billion in funding tied to its broader initiative focused on what it calls “American Dynamism.”

Of that total, the venture capital firm said $6.75 billion would be dedicated to a growth fund, while two additional $1.7 billion funds would support applications and infrastructure investments.

AI’s Security Race Intensifies

The move highlights a growing reality across the AI industry: as artificial intelligence systems become more powerful and deeply integrated into businesses and government infrastructure, security testing is rapidly becoming as critical as the technology itself.

With Promptfoo’s tools now entering OpenAI’s ecosystem, the acquisition signals another step in the company’s effort to fortify the digital scaffolding supporting the next generation of AI agents.

In the increasingly high-stakes world of artificial intelligence, building smarter systems is only half the battle — ensuring they behave safely may prove just as important.