GPT-5.5 Instant: healthcare benchmark results
OpenAI · 3 boards · snapshot reviewed September 28, 2026
The index currently holds 3 results for GPT-5.5 Instant: 0.384 on HealthBench Professional (28 of 29 indexed rows), 0.229 on HealthBench Hard (19 of 20 indexed rows), 51.4 on HealthBench (24 of 26 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
| benchmark | score | index position | as of |
|---|---|---|---|
| HealthBench Professional length-adjusted (40.7 unadjusted, 2,775 mean response chars); GPT-5.5 Instant system card Table 5, column GPT-5.5 INSTANT. | 0.384 | 28 of 29 | 2026-05 |
| HealthBench Hard length-adjusted (21.3 unadjusted, 1,794 mean response chars); GPT-5.5 Instant system card Table 5, column GPT-5.5 INSTANT. | 0.229 | 19 of 20 | 2026-05 |
| HealthBench length-adjusted, GPT-5.5 Instant system card Table 5 column GPT-5.5 INSTANT (50.9 unadjusted, 1,922 chars); same number in GPT-5.6 August Updates p. 11 | 51.4 | 24 of 26 | 2026-05 |
Position follows the rows held in this index and is not a controlled comparison. Sources may use different graders or task subsets. Positions include 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.
Which healthcare benchmarks is GPT-5.5 Instant scored on?
As of September 28, 2026, GPT-5.5 Instant has indexed results on 3 tracked benchmarks: HealthBench Professional, HealthBench Hard, HealthBench.
Which results are indexed for GPT-5.5 Instant?
GPT-5.5 Instant stands at 0.384 on HealthBench Professional (28 of 29 indexed rows), 0.229 on HealthBench Hard (19 of 20 indexed rows), 51.4 on HealthBench (24 of 26 indexed rows).
The benchmarks themselves are described on their pages, linked in the table above, and the whole field is on the index.