OpenAI acquires Promptfoo to safe its AI brokers

OpenAI introduced Monday it has acquired Promptfoo, an AI safety startup based in 2024 to guard LLMs from on-line adversaries.

The frontier lab mentioned in a blog post that when the deal closes, Promptfoo’s expertise will likely be built-in into OpenAI Frontier, its enterprise platform for AI brokers.

The event of unbiased AI brokers that carry out digital duties has generated pleasure about productiveness positive aspects. However it’s additionally given unhealthy actors contemporary alternatives to entry delicate information or manipulate automated methods. This deal underscores how frontier labs are scrambling to show their expertise can be utilized safely in vital enterprise operations.

Promptfoo was based by Ian Webster and Michael D’Angelo to develop instruments that corporations can use to check safety vulnerabilities in LLMs, together with an open-source interface and library. The corporate stories that its merchandise are utilized by greater than 25% of Fortune 500 corporations.

Promptfoo has raised simply $23 million since its founding, and was valued at $86 million after its most up-to-date spherical in July 2025, in line with Pitchbook. OpenAI didn’t disclose the worth of the transaction.

OpenAI’s put up mentioned Promptfoo’s expertise will permit its agent platform to carry out automated red-teaming, consider agentic workflows for safety issues, and monitor actions for dangers and compliance wants. The corporate additionally mentioned it expects to proceed constructing out Promptfoo’s open-source providing.