GPT-6 Astra is our healthiest model yet. ♥️ It sets a new state of the art on HealthBench Professional, our benchmark of real clinician tasks, including care consultations, medical documentation, and research. At its lowest reasoning effort, Astra already surpasses GPT-5.6 Sol’s best score at about half the cost. This evaluation is intentionally designed to be challenging for our models and focuses on especially complex and rare situations. On another internal evaluation more representative of health questions people often ask ChatGPT, Astra was more than three times less likely to make factual mistakes than GPT-5.6 Sol at their strongest reasoning settings. We hope this release is another step towards trustworthy, abundant health intelligence for patients and clinicians.

Today, we’re bringing ChatGPT closer to the systems, information, and workflows healthcare teams already rely on. ♥️ We’re introducing a new EHR integration to connect supported Epic environments to ChatGPT and a plugin connecting to nine additional industry data sources.

We're rolling out Health in ChatGPT to all U.S. users. ♥️ More than 300 million people come to ChatGPT every week with health questions. Today, ChatGPT can bring together the health info you choose to connect to make conversations more personal and useful.

♥️ GPT-5.6 is a major step forward for health, both at the frontier and at cost. These models push the frontier of performance per dollar, bringing the best health intelligence to all. The smallest variant, GPT-5.6 Luna, evaluated at the lowest reasoning effort, outperforms GPT-5.5 at the highest reasoning effort–despite costing 25x less. The largest variant, GPT-5.6 Sol, sets a new high bar at cost. Another especially cool result: physicians found fewer flaws in GPT-5.6 responses than physician-written responses. We collected diverse tasks that remain difficult for recent OpenAI models, across patient-facing and clinician-facing use cases. We asked speciality-matched physicians to write responses to these tasks with unlimited time and web access. We then asked other physicians to compare responses side-by-side, blinded to their source. Physicians were asked to comment on areas of improvement across five axes: accuracy, communication, completeness, instruction following, and health decision helpfulness. We then reported the fraction of responses across sources rated perfectly across all axes, across 20,000 total axis ratings. GPT-5.6 Sol appeared strongest, although all GPT-5.6 models performed significantly better than physicians.

We’re bringing frontier health intelligence to everyone for free in ChatGPT. GPT-5.5 Instant is a substantial step forward for health–reaching frontier performance–and because it’s available to all free users, more people benefit. 🧵 xitter.cf/OpenAI/status/20676727…