GPT-5.5 Instant: healthcare benchmark results

OpenAI · 4 boards · updated September 8, 2026

The index currently holds 6 results for GPT-5.5 Instant: 0.384 on HealthBench Professional (21 of 22 indexed rows), 0.229 on HealthBench Hard (15 of 16 indexed rows), 51.4 on HealthBench (17 of 18 indexed rows), 0.999 on OpenAI Dynamic Mental Health Evaluations (2 of 15 indexed rows), 0.991 on OpenAI Dynamic Mental Health Evaluations (3 of 15 indexed rows), 0.981 on OpenAI Dynamic Mental Health Evaluations (11 of 15 indexed rows). Scores below sit on different scales and come from different graders, so read each against its own benchmark, never against the others.

Results by benchmark

Position follows the rows held in this index, including separate configurations. A source board may contain additional rows; its size is listed separately when it differs. Config caveats, where a source noted any, are on each benchmark's page, and the document behind each score is cited on the sources page. Sources also list this model as "GPT-5.5 Instant (June Update)" and "GPT-5.5 Instant (May Update)".

The benchmarks themselves are described on their pages, linked in the table above, and the whole field is on the index.