Here’s a sentence that would have sounded like science fiction two years ago: doctors reviewed medical responses, rated them blind, and the AI came out ahead. Not slightly ahead. Measurably, consistently ahead across roughly 20,000 individual axis ratings.
OpenAI launched the GPT-5.6 family on July 9, 2026, and the headline number is this: in blinded physician comparisons, GPT-5.6 responses contained fewer flaws than responses written by human physicians who had unlimited time and access to information.
What the benchmarks actually show
The primary scorecard here is HealthBench Professional, a benchmark designed specifically to evaluate medical communication quality. GPT-5.6 Sol, the high-capability variant of the new model family, scored 60.5 on HealthBench Professional. For reference, GPT-5.5 scored 59.0 on the same benchmark. Physician-written responses scored 43.7.
The evaluation methodology matters here. OpenAI’s approach involved a global network of 260 physicians spread across 60 countries and 26 medical specialties. These doctors reviewed over 700,000 model responses, identifying common failure modes and refining the rubrics used to score them.
