An American man has sued OpenAI and its founder Sam Altman, alleging that ChatGPT medical advice brought him close to death. According to the report, the lawsuit claims the chatbot repeatedly misdiagnosed him when he used the popular AI tool for health-related guidance.

The case puts fresh attention on how people use AI chatbots in high-stakes situations such as medical decisions. While ChatGPT is widely used for information and everyday questions, the legal complaint described in the report argues that the answers it provided were dangerously wrong.

ChatGPT’s own terms of use warn users not to treat the platform as a sole source of truth, especially in situations that could have a legal or material impact. That warning is particularly relevant in medical matters, where inaccurate advice can carry serious risks if it is followed instead of professional care.

The lawsuit is likely to add to wider scrutiny of AI tools and the responsibilities of companies behind them. At the center of this dispute is whether general-purpose chatbots can be safely relied on for medical guidance, even when their terms clearly caution against that use.