GPT-5.5 Instant: ChatGPT Health AI Now Free, 71% Fewer Errors

ChatGPT's health responses are getting a major upgrade for all users, including those on the free tier. This improvement comes with the new GPT-5.5 Instant model. OpenAI reports a significant 71% drop in health-related factual errors. Doctors also rated this new model highly in an internal review. The update focuses on four key areas: recognizing urgent situations, asking for relevant context, explaining uncertainty, and simplifying complex health information. The company states that GPT-5.5 Instant now performs comparably to their more advanced, premium models for health evaluations. However, independent studies still suggest AI struggles with accurate medical diagnosis. While ChatGPT can help explain health information, it is not a replacement for a doctor. This matters because over 230 million people use ChatGPT for health and wellness questions every week.