Claude Sonnet 5 on HealthBench Professional

rank 13 of 31 · updated September 30, 2026

Claude Sonnet 5 scores 0.578 on HealthBench Professional, rank 13 of 31 models on the board. Anthropic's mid-tier model, positioned for speed at near-Opus quality. 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	13 of 31
score	0.578
lab	Anthropic
context window	1.0M tokens
API price per 1M tokens	$2.00 in / $10.00 out
license	proprietary
source	System Card: Claude Sonnet 5 (system card)
released	2026-06-30

Position in the field

The gap to the leader, GPT-6 Astra (Anthropic run) at 0.703, is 0.125. Directly above sits Muse Spark 1.1 at 0.593. Directly below sits GPT-5.6 Terra at 0.577. 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 System Card: Claude Sonnet 5 (system card, Anthropic, 2026-06-30). Vendor-reported. Confidence: verified. Configuration: length-adjusted, Anthropic protocol: adaptive thinking at max effort, Claude Opus 4.8 grader, averaged over 5 trials, no tools or custom system prompt (raw 62.4%)..

HealthBench Professional 57.8 44.2 51.8 -

p. 115, Table 8.1.A, row HealthBench Professional, column Claude Sonnet 5; Figure 8.12.2.A p. 139 · 1 corroborating document · full entry on the sources page

What does Claude Sonnet 5 score on HealthBench Professional?

Claude Sonnet 5 scores 0.578 on HealthBench Professional, which places it at rank 13 of 31 models on the board as of September 30, 2026. The number was read from System Card: Claude Sonnet 5, listed on the sources page.

How much does Claude Sonnet 5 cost to run?

Claude Sonnet 5 is priced at $2.00 per million input tokens and $10.00 per million output tokens through Anthropic's API.

Head to head

Pairings with a dedicated comparison page are linked; every other difference is in the score-difference matrix.

Claude Sonnet 5 vs GPT-6 Astra (Anthropic run)
0.578 vs 0.703 · GPT-6 Astra (Anthropic run) by 0.125
Claude Sonnet 5 vs Claude Sonnet 5.5
0.578 vs 0.692 · Claude Sonnet 5.5 by 0.114
Claude Sonnet 5 vs Claude Fable 5
0.578 vs 0.660 · Claude Fable 5 by 0.082
Claude Sonnet 5 vs Claude Opus 5.5
0.578 vs 0.656 · Claude Opus 5.5 by 0.078
Claude Sonnet 5 vs GPT-6 Astra
0.578 vs 0.647 · GPT-6 Astra by 0.069
Claude Sonnet 5 vs Claude Fable 5 (September card)
0.578 vs 0.633 · Claude Fable 5 (September card) by 0.055
Claude Sonnet 5 vs Claude Fable 5.1
0.578 vs 0.621 · Claude Fable 5.1 by 0.043
Claude Sonnet 5 vs GPT-6 Luna
0.578 vs 0.608 · GPT-6 Luna by 0.030
Claude Sonnet 5 vs GPT-6 Sol
0.578 vs 0.608 · GPT-6 Sol by 0.030
Claude Sonnet 5 vs GPT-5.6 Sol
0.578 vs 0.605 · GPT-5.6 Sol by 0.027
Claude Sonnet 5 vs Claude Opus 5
0.578 vs 0.598 · Claude Opus 5 by 0.020
Claude Sonnet 5 vs Muse Spark 1.1
0.578 vs 0.593 · Muse Spark 1.1 by 0.015
Claude Sonnet 5 vs GPT-5.6 Terra
0.578 vs 0.577 · Claude Sonnet 5 by 0.001
Claude Sonnet 5 vs Claude Opus 4.8 (Opus 4.8 grader)
0.578 vs 0.574 · Claude Sonnet 5 by 0.004
Claude Sonnet 5 vs Grok 4.7
0.578 vs 0.567 · Claude Sonnet 5 by 0.011
Claude Sonnet 5 vs Claude Opus 4.8
0.578 vs 0.558 · Claude Sonnet 5 by 0.020
Claude Sonnet 5 vs GPT-5.6 Luna
0.578 vs 0.557 · Claude Sonnet 5 by 0.021
Claude Sonnet 5 vs Muse Spark
0.578 vs 0.541 · Claude Sonnet 5 by 0.037
Claude Sonnet 5 vs GPT-5.6 Sol (August)
0.578 vs 0.540 · Claude Sonnet 5 by 0.038
Claude Sonnet 5 vs Claude Opus 4.7
0.578 vs 0.519 · Claude Sonnet 5 by 0.059
Claude Sonnet 5 vs GPT-5.5
0.578 vs 0.518 · Claude Sonnet 5 by 0.060
Claude Sonnet 5 vs Grok 4.6
0.578 vs 0.485 · Claude Sonnet 5 by 0.093
Claude Sonnet 5 vs GPT-5.4
0.578 vs 0.481 · Claude Sonnet 5 by 0.097
Claude Sonnet 5 vs GPT-5
0.578 vs 0.462 · Claude Sonnet 5 by 0.116
Claude Sonnet 5 vs GPT-5.2
0.578 vs 0.459 · Claude Sonnet 5 by 0.119
Claude Sonnet 5 vs Claude Sonnet 4.6
0.578 vs 0.442 · Claude Sonnet 5 by 0.136
Claude Sonnet 5 vs GPT-5.6 Luna (August)
0.578 vs 0.441 · Claude Sonnet 5 by 0.137
Claude Sonnet 5 vs GPT-5.1
0.578 vs 0.396 · Claude Sonnet 5 by 0.182
Claude Sonnet 5 vs GPT-5.5 Instant
0.578 vs 0.384 · Claude Sonnet 5 by 0.194
Claude Sonnet 5 vs MAI-Thinking-1
0.578 vs 0.350 · Claude Sonnet 5 by 0.228

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