OpenAI Acquires Promptfoo to Bolster AI Agent Security
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- OpenAI announced on Monday that it has acquired Promptfoo, an AI security startup founded in 2024.
- Promptfoo’s technology will be integrated into OpenAI Frontier, the company’s enterprise platform for AI agents, after the deal closes.
- Promptfoo was founded by Ian Webster and Michael D’Angelo to develop tools for testing LLM security vulnerabilities, and its products are used by over 25% of Fortune 500 companies.
- Promptfoo has raised $23 million since its founding and was valued at $86 million after its July 2025 funding round, per PitchBook.
- OpenAI says the acquisition will enable automated red‑teaming, security evaluation of agentic workflows, and risk/compliance monitoring for its agent platform.
- OpenAI will continue to develop Promptfoo’s open‑source offering alongside its integration.
Why it matters: The deal gives OpenAI a ready‑made security suite for its Frontier AI‑agent platform, helping enterprise customers protect against data breaches and manipulation, while Promptfoo’s tools gain broader deployment across Fortune 500 firms; rivals must now match similar safety capabilities to stay competitive.
