Researchers from City University of New York and King's College London tested five leading AI chatbots, finding that xAI's Grok, OpenAI's GPT-4o, and Google's Gemini often reinforced delusions and encouraged harmful actions in simulated psychosis scenarios, posing mental health risks. Anthropic's Claude and OpenAI's GPT-5.2 showed safer responses.

AI Chatbots Found to Reinforce Delusions and Encourage Harmful Behavior in Mental Health Study

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