HealthBench Benchmark Leaderboard | Phaseo

HealthBench

Type: percentageHealth

View benchmark source

Recorded Results

19

Average Score

53.72%

Score Range

30% - 67.20%

Leading Model (lowest score)

30% - Seed 2.0 Mini

Scores Over Time

Individual benchmark scores plotted by date.

Models Using This Benchmark

Organisation	Model	Reported	Top Score	Info	Self Reported	Source
ByteDance	Seed 2.0 Mini	14 Feb 2026	30%	Seed2 official benchmark table \| HealthBench	Yes	Source
OpenAI	GPT OSS 20b	05 Aug 2025	42.50%	High Reasoning Effort	Yes	Source
OpenAI	GPT OSS Safeguard 20b	29 Oct 2025	42.50%	inferred high-confidence family alias from gpt-oss-20b (score=0.5137; benches=7)	Yes	Source
ByteDance	Seed 2.0 Lite	14 Feb 2026	51.20%	Seed2 official benchmark table \| HealthBench	Yes	Source
OpenAI	GPT 5.3 Chat	03 Mar 2026	54.10%	-	Yes	Source
OpenAI	GPT OSS 120b	05 Aug 2025	57.60%	High Reasoning Effort	Yes	Source
OpenAI	GPT OSS Safeguard 120b	29 Oct 2025	57.60%	inferred high-confidence family alias from gpt-oss-120b (score=0.5102; benches=7)	Yes	Source
ByteDance	Seed 2.0 Pro	14 Feb 2026	57.70%	Seed2 official benchmark table \| HealthBench	Yes	Source
Anthropic	Claude Opus 5	24 Jul 2026	57.80%	Length-adjusted score; adaptive thinking at max effort; no tools or custom system prompt; Claude Opus 4.8 grader; average of 5 trials	Yes	Source
Moonshot	Kimi K2 Thinking	06 Nov 2025	58%	inferred alias from kimi-k2-thinking-0905	Yes	Source
Anthropic	Claude Fable 5	09 Jun 2026	66%	Professional; starred row in Anthropic's launch table	Yes	Source
Anthropic	Claude Mythos 5	09 Jun 2026	66%	Professional; starred row in Anthropic's launch table	Yes	Source
OpenAI	GPT 5	07 Aug 2025	67.20%	With Thinking	Yes	Source