AI Hallucination evaluation is broken, says OpenAI - stop "suppressing" it Trillion-dollar industry can't even measure its biggest problem -- "calibration" not the answer, says OpenAI Edward Targett Sep 09, 2025 - 4 min read This post is for paying subscribers only Join peers managing over $100 billion in annual IT spend and subscribe to unlock full access to The Stack’s analysis and events. Subscribe now Already a member? Sign in