OpenAI has announced significant improvements to ChatGPT’s health intelligence with GPT-5.5 Instant, its latest model available to free users. The update strengthens the system’s ability to recognize when urgent care may be needed, ask for relevant context, explain uncertainty, and communicate complex health information more clearly.
OpenAI says GPT-5.5 Instant now performs at a level comparable to its frontier reasoning models on key health evaluations, including HealthBench Professional.
The company also reported a 71% reduction in health responses flagged for possible factuality issues over the past two months, supported by physician-led evaluations and large-scale production monitoring.
