GPT-6 Astra on HealthBench Professional
rank 2 of 22 · updated September 8, 2026
GPT-6 Astra scores 0.634 on HealthBench Professional, rank 2 of 22 models on the board. The first GPT-6 model, shipped September 3, 2026, at twice the input price of GPT-5.6 Sol. HealthBench Professional scores models on 525 tasks drawn from real clinician conversations, graded criterion by criterion against physician-written rubrics on a 0 to 1 scale.
Result and API facts
| rank | 2 of 22 |
|---|---|
| score | 0.634 |
| lab | OpenAI |
| context window | 1.05M tokens |
| API price per 1M tokens | $10.00 in / $50.00 out |
| license | proprietary |
| source | GPT-6 Astra System Card (system card) |
| released | 2026-09-03 |
Position in the field
The gap to the leader, Claude Fable 5 at 0.660, is 0.026. Directly below sits Claude Fable 5.1 at 0.621. The scores on this page are compiled from published documents rather than from one controlled run, so a small gap between 2 models can reflect a difference in grader version, reasoning effort, or deployment setting as well as a difference in capability.
Source of this score
Read from GPT-6 Astra System Card (system card, OpenAI, 2026-09-03). Vendor-reported. Confidence: verified. Configuration: length-adjusted, max reasoning effort (69.5 unadjusted, 4,097 mean response chars); GPT-6 Astra system card Table 6, column 'gpt-6 Astra'..
Astra has a length-adjusted HealthBench Professional score of 63.4 (+2.9 relative to GPT-5.6 Sol), HealthBench score of 58.1 (+1.1), HealthBench Hard score of 36.3 (+3.2), and HealthBench Consensus score of 95.8 (+0.3).
p. 19, sec. 6.1 (Table 6 cell, column 'gpt-6 Astra': 63.4 (69.5, 4097)) · 2 corroborating documents · full entry on the sources page
What does GPT-6 Astra score on HealthBench Professional?
GPT-6 Astra scores 0.634 on HealthBench Professional, which places it at rank 2 of 22 models on the board as of September 8, 2026. The number was read from GPT-6 Astra System Card, listed on the sources page.
How much does GPT-6 Astra cost to run?
GPT-6 Astra is priced at $10.00 per million input tokens and $50.00 per million output tokens through OpenAI's API.
Head to head
Pairings with a dedicated comparison page are linked; every other difference is in the score-difference matrix.
- GPT-6 Astra vs Claude Fable 50.634 vs 0.660 · Claude Fable 5 by 0.026
- GPT-6 Astra vs Claude Fable 5.10.634 vs 0.621 · GPT-6 Astra by 0.013
- GPT-6 Astra vs GPT-5.6 Sol0.634 vs 0.605 · GPT-6 Astra by 0.029
- GPT-6 Astra vs Claude Opus 50.634 vs 0.598 · GPT-6 Astra by 0.036
- GPT-6 Astra vs Muse Spark 1.10.634 vs 0.593 · GPT-6 Astra by 0.041
- GPT-6 Astra vs Claude Sonnet 50.634 vs 0.578 · GPT-6 Astra by 0.056
- GPT-6 Astra vs GPT-5.6 Terra0.634 vs 0.577 · GPT-6 Astra by 0.057
- GPT-6 Astra vs Claude Opus 4.80.634 vs 0.558 · GPT-6 Astra by 0.076
- GPT-6 Astra vs GPT-5.6 Luna0.634 vs 0.557 · GPT-6 Astra by 0.077
- GPT-6 Astra vs Muse Spark0.634 vs 0.541 · GPT-6 Astra by 0.093
- GPT-6 Astra vs GPT-5.6 Sol (August)0.634 vs 0.540 · GPT-6 Astra by 0.094
- GPT-6 Astra vs Claude Opus 4.70.634 vs 0.519 · GPT-6 Astra by 0.115
- GPT-6 Astra vs GPT-5.50.634 vs 0.518 · GPT-6 Astra by 0.116
- GPT-6 Astra vs GPT-5.40.634 vs 0.481 · GPT-6 Astra by 0.153
- GPT-6 Astra vs GPT-50.634 vs 0.462 · GPT-6 Astra by 0.172
- GPT-6 Astra vs GPT-5.20.634 vs 0.459 · GPT-6 Astra by 0.175
- GPT-6 Astra vs Claude Sonnet 4.60.634 vs 0.442 · GPT-6 Astra by 0.192
- GPT-6 Astra vs GPT-5.6 Luna (August)0.634 vs 0.441 · GPT-6 Astra by 0.193
- GPT-6 Astra vs GPT-5.10.634 vs 0.396 · GPT-6 Astra by 0.238
- GPT-6 Astra vs GPT-5.5 Instant0.634 vs 0.384 · GPT-6 Astra by 0.250
- GPT-6 Astra vs MAI-Thinking-10.634 vs 0.350 · GPT-6 Astra by 0.284
Where the scores come from and how they are read is on the methodology page. The full ranking is on the leaderboard.