OpenAI acquires Promptfoo to secure its AI agents
Image: Primary OpenAI announced Monday that it has acquired Promptfoo, an AI security startup founded in 2024 to protect large language models from online adversaries.
The startup was founded by Ian Webster and Michael D'Angelo. It develops tools that companies can use to test security vulnerabilities in large language models, including an open source interface and library.
Once the deal closes, Promptfoo's technology will be integrated into OpenAI Frontier, the company's enterprise platform for AI agents. The integration will allow automated red-teaming, evaluation of agentic workflows for security concerns, and monitoring of activities for risks and compliance needs.
Promptfoo's products are used by more than 25 percent of Fortune 500 companies. The company has raised 23 million dollars since its founding and was valued at 86 million dollars after its most recent round in July 2025, according to PitchBook.
OpenAI did not disclose the value of the transaction. The company said it expects to continue building out Promptfoo's open source offering.
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