Health in ChatGPT is now available to U.S. users 18 and older on web and iOS across Free, Go, Plus, and Pro plans. You can link Apple Health or supported medical records—from hospital systems, One Medical, or Function Health—to give ChatGPT direct access to your lab results, medications, sleep and activity data. With your permission, ChatGPT compares new results with past tests, flags trends since your last appointment, and weaves in dietary restrictions or recent injuries when planning meals or workouts. You can still ask health questions without connecting anything, and you decide case by case whether to let ChatGPT draw on your data. Under the hood, two models power the feature: GPT-5.5 Instant for all users and GPT-5.6 Sol for paid subscribers. GPT-5.5 Instant already matches earlier “frontier Thinking” models on demanding health evaluations, recognizing when urgent care may be needed and explaining uncertainty. GPT-5.6 Sol boosts performance on complex reasoning, clear communication and careful judgment. In testing—with physicians running HealthBench Professional benchmarks—every GPT-5.6 variant outscored GPT-5.5 on challenging health tasks. Privacy and control sit at the core. All conversations and connected data are encrypted in transit and at rest. Your medical records and Apple Health details never train foundation models or inform ads. By default, ChatGPT asks before accessing your health data, and you can disconnect sources any time; synced data is deleted within 30 days (though conversation history remains until you delete it). Memories created from your chats can be managed or turned off, and extra safeguards kick in before any plugin shares your health information externally. To get started, open the Health tab in the sidebar, grant permission to link a data source, and follow the prompts. Once set up, you’ll find a dedicated hub showing synced records, trends, suggested prompts, and past conversations—and you’ll also benefit from contextual health insights woven into ordinary chats.