GPT-6 Astra on HealthBench Professional

rank 5 of 31 · updated September 30, 2026

GPT-6 Astra scores 0.647 on HealthBench Professional, rank 5 of 31 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	5 of 31
score	0.647
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 - HealthBench (Deployment Safety Hub) (system card)
released	2026-09-03

Position in the field

The gap to the leader, GPT-6 Astra (Anthropic run) at 0.703, is 0.056. Directly above sits Claude Opus 5.5 at 0.656. Directly below sits Claude Fable 5 (September card) at 0.633. 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 - HealthBench (Deployment Safety Hub) (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'..

Evaluation | GPT-5.5 | GPT-5.6 Sol | GPT-5.6 Terra | GPT-5.6 Luna | GPT-6 Astra | GPT-6 Sol | GPT-6 Luna HealthBench Professional length-adjusted | 51.8 (57.2, 3818) | 60.5 (64.1, 3228) | 57.7 (62.4, 3618) | 55.7 (59.8, 3389) | 64.7 (68.2, 3185) | 60.8 (59.5, 1573) | 60.8 (61.2, 2119)

Section 11.4.1, Table 29, HealthBench Professional length-adjusted, GPT-6 Astra column; September 22 correction. · 3 corroborating documents · full entry on the sources page

What does GPT-6 Astra score on HealthBench Professional?

GPT-6 Astra scores 0.647 on HealthBench Professional, which places it at rank 5 of 31 models on the board as of September 30, 2026. The number was read from GPT-6 Astra System Card - HealthBench (Deployment Safety Hub), 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 GPT-6 Astra (Anthropic run)
0.647 vs 0.703 · GPT-6 Astra (Anthropic run) by 0.056
GPT-6 Astra vs Claude Sonnet 5.5
0.647 vs 0.692 · Claude Sonnet 5.5 by 0.045
GPT-6 Astra vs Claude Fable 5
0.647 vs 0.660 · Claude Fable 5 by 0.013
GPT-6 Astra vs Claude Opus 5.5
0.647 vs 0.656 · Claude Opus 5.5 by 0.009
GPT-6 Astra vs Claude Fable 5 (September card)
0.647 vs 0.633 · GPT-6 Astra by 0.014
GPT-6 Astra vs Claude Fable 5.1
0.647 vs 0.621 · GPT-6 Astra by 0.026
GPT-6 Astra vs GPT-6 Luna
0.647 vs 0.608 · GPT-6 Astra by 0.039
GPT-6 Astra vs GPT-6 Sol
0.647 vs 0.608 · GPT-6 Astra by 0.039
GPT-6 Astra vs GPT-5.6 Sol
0.647 vs 0.605 · GPT-6 Astra by 0.042
GPT-6 Astra vs Claude Opus 5
0.647 vs 0.598 · GPT-6 Astra by 0.049
GPT-6 Astra vs Muse Spark 1.1
0.647 vs 0.593 · GPT-6 Astra by 0.054
GPT-6 Astra vs Claude Sonnet 5
0.647 vs 0.578 · GPT-6 Astra by 0.069
GPT-6 Astra vs GPT-5.6 Terra
0.647 vs 0.577 · GPT-6 Astra by 0.070
GPT-6 Astra vs Claude Opus 4.8 (Opus 4.8 grader)
0.647 vs 0.574 · GPT-6 Astra by 0.073
GPT-6 Astra vs Grok 4.7
0.647 vs 0.567 · GPT-6 Astra by 0.080
GPT-6 Astra vs Claude Opus 4.8
0.647 vs 0.558 · GPT-6 Astra by 0.089
GPT-6 Astra vs GPT-5.6 Luna
0.647 vs 0.557 · GPT-6 Astra by 0.090
GPT-6 Astra vs Muse Spark
0.647 vs 0.541 · GPT-6 Astra by 0.106
GPT-6 Astra vs GPT-5.6 Sol (August)
0.647 vs 0.540 · GPT-6 Astra by 0.107
GPT-6 Astra vs Claude Opus 4.7
0.647 vs 0.519 · GPT-6 Astra by 0.128
GPT-6 Astra vs GPT-5.5
0.647 vs 0.518 · GPT-6 Astra by 0.129
GPT-6 Astra vs Grok 4.6
0.647 vs 0.485 · GPT-6 Astra by 0.162
GPT-6 Astra vs GPT-5.4
0.647 vs 0.481 · GPT-6 Astra by 0.166
GPT-6 Astra vs GPT-5
0.647 vs 0.462 · GPT-6 Astra by 0.185
GPT-6 Astra vs GPT-5.2
0.647 vs 0.459 · GPT-6 Astra by 0.188
GPT-6 Astra vs Claude Sonnet 4.6
0.647 vs 0.442 · GPT-6 Astra by 0.205
GPT-6 Astra vs GPT-5.6 Luna (August)
0.647 vs 0.441 · GPT-6 Astra by 0.206
GPT-6 Astra vs GPT-5.1
0.647 vs 0.396 · GPT-6 Astra by 0.251
GPT-6 Astra vs GPT-5.5 Instant
0.647 vs 0.384 · GPT-6 Astra by 0.263
GPT-6 Astra vs MAI-Thinking-1
0.647 vs 0.350 · GPT-6 Astra by 0.297

Where the scores come from and how they are read is on the methodology page. The full ranking is on the leaderboard.