OpenAI acquires Promptfoo to safe its AI brokers

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

The frontier lab stated in a weblog submit that when the deal closes, Promptfoo’s know-how will probably 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. Nevertheless it’s additionally given unhealthy actors contemporary alternatives to entry delicate knowledge or manipulate automated programs. This deal underscores how frontier labs are scrambling to show their know-how can be utilized safely in crucial enterprise operations.

Promptfoo was based by Ian Webster and Michael D’Angelo to develop instruments that corporations can use to check security vulnerabilities in LLMs, together with an open-source interface and library. The corporate studies 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 accordance with Pitchbook. OpenAI didn’t disclose the worth of the transaction.

OpenAI’s submit stated Promptfoo’s know-how will permit its agent platform to carry out automated red-teaming, consider agentic workflows for security considerations, and monitor actions for dangers and compliance wants. The corporate additionally stated it expects to proceed constructing out Promptfoo’s open-source providing.