Krux
March 12, 2026
OpenAI Acquires AI Security Startup for $86M Valuation
Published: March 12, 2026 at 12:27 AM
Updated: March 12, 2026 at 12:27 AM
100-word summary
OpenAI announced plans to acquire Promptfoo, an AI security testing startup last valued at $86 million. Terms weren't disclosed, but the deal signals OpenAI is racing to lock down its autonomous agents before selling them to enterprises. Promptfoo specializes in red-teaming tools that probe AI systems for vulnerabilities before hackers do. Its tech will fold into OpenAI Frontier, the company's enterprise agent platform. Founders Ian Webster and Michael D'Angelo will join OpenAI to lead the integration. The deal still needs to clear standard closing conditions. Promptfoo's open-source tools will continue during the transition, backed by investors like Andreessen Horowitz and Insight Partners.
What happened
OpenAI announced plans to acquire Promptfoo, an AI security testing startup last valued at $86 million. Terms weren't disclosed, but the deal signals OpenAI is racing to lock down its autonomous agents before selling them to enterprises. Promptfoo specializes in red-teaming tools that probe AI systems for vulnerabilities before hackers do. Its tech will fold into OpenAI Frontier, the company's enterprise agent platform. Founders Ian Webster and Michael D'Angelo will join OpenAI to lead the integration. The deal still needs to clear standard closing conditions.
Why it matters
Promptfoo's open-source tools will continue during the transition, backed by investors like Andreessen Horowitz and Insight Partners.