OpenAI Acquires Promptfoo to Secure AI Agents on Frontier Platform
OpenAI just made its most important security acquisition yet. On Monday, the company announced it’s acquiring Promptfoo, the AI security startup that’s quietly become essential infrastructure for testing LLM vulnerabilities — used by over 25% of Fortune 500 companies and 125,000 developers worldwide. The price tag wasn’t disclosed, but the strategic message is crystal clear: as AI agents move from demo-day toys to production infrastructure, OpenAI is making a direct bet that security tooling needs to be built into the platform itself. ...