AI that can ask clarifying questions is more helpful, reliable, and less frustrating for users.Researchers created QuestBench to test if AI can identify the missing information needed to solve a problem.They focused on situations with one missing ingredient to measure if the AI asks the right question.Cutting-edge language models like GPT-4, Claude 3.5, and Gemini 1.5/2.0 were tested using QuestBench.