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Promptfoo was founded by Ian Webster and Michael D'Angelo to create a platform for developers to systematically test and secure AI applications.

Raised $18.4 million in a Series A funding round led by Insight Partners, with participation from Andreessen Horowitz, reaching a valuation of $85.5 million.

OpenAI announced its acquisition of Promptfoo to integrate its security technology and bolster the safety of its enterprise-grade AI agent platforms.