OpenAI said it plans to acquire AI testing startup Promptfoo, a move aimed at strengthening security checks for AI agents as enterprises move toward deploying autonomous systems in business workflows. Promptfoo’s tools allow developers to test LLM applications against adversarial prompts, including prompt injection and jailbreak attempts, and to evaluate whether models follow safety and reliability guidelines. In a statement, OpenAI said Promptfoo’s technology will be integrated into OpenAI Frontier, its platform for building and operating AI coworkers. OpenAI added that the Promptfoo team has built tools used by more than 25% of Fortune 500 companies, including an open-source command line i...