OpenAI acquires Promptfoo for AI security
OpenAI acquired Promptfoo, a cybersecurity startup specializing in AI agent security testing, to enhance the security of its Frontier platform.
Promptfoo, founded in 2024, specializes in automated security testing and evaluation for AI systems, identifying vulnerabilities like prompt injection and data leakage. Their platform allows developers to simulate adversarial attacks within their existing workflows. The acquisition highlights the increasing importance of security as enterprises deploy AI agents for real-world tasks. OpenAI plans to integrate Promptfoo's technology into its Frontier platform, which is designed for building and operating AI coworkers. This will enhance Frontier with automated security testing, red-teaming capabilities, and improved reporting and traceability. The goal is to provide enterprises with systematic tools to test AI agent behavior and detect risks before deployment. Promptfoo's tools are already used by more than 25% of Fortune 500 companies. They offer an open-source command line interface and library for testing LLM applications, which OpenAI plans to continue improving. The acquisition signals that security, evaluation, and compliance are critical for enterprise AI agent production. The financial terms of the deal were not disclosed. However, Promptfoo had raised over $23 million in funding and was reportedly valued at $86 million after a Series A funding round in July 2025. The entire Promptfoo team is joining OpenAI.
