LongFact-Concepts hallucination rate Benchmark Leaderboard | Phaseo

LongFact-Concepts hallucination rate

Type: percentageHallucinations

Recorded Results

7

Average Score

49.90%

Score Range

1.10% - 100%

Leading Model

100% - GPT 5

Scores Over Time

Individual benchmark scores plotted by date.

Models Using This Benchmark

Organisation	Model	Reported	Top Score	Info	Self Reported	Source
OpenAI	GPT 5	07 Aug 2025	100%	High Reasoning Effort	Yes	Source
OpenAI	GPT 5 Nano	07 Aug 2025	100%	High Reasoning Effort	Yes	Source
OpenAI	GPT 4.1	14 Apr 2025	70%	-	Yes	Source
OpenAI	GPT 5 Mini	07 Aug 2025	70%	High Reasoning Effort	Yes	Source
OpenAI	o3	16 Apr 2025	5.20%	High Reasoning Effort	Yes	Source
OpenAI	o4 Mini	16 Apr 2025	3%	High Reasoning Effort	Yes	Source
OpenAI	GPT 4.1 Mini	14 Apr 2025	1.10%	-	Yes	Source