LongFact-Objects hallucination rate Benchmark Leaderboard | Phaseo

LongFact-Objects hallucination rate

Type: percentageHallucinations

Recorded Results

7

Average Score

3.41%

Score Range

1.10% - 8.90%

Leading Model

8.90% - o4 Mini

Scores Over Time

Individual benchmark scores plotted by date.

Models Using This Benchmark

Organisation	Model	Reported	Top Score	Info	Self Reported	Source
OpenAI	o4 Mini	16 Apr 2025	8.90%	High Reasoning Effort	Yes	Source
OpenAI	o3	16 Apr 2025	6.80%	High Reasoning Effort	Yes	Source
OpenAI	GPT 5 Nano	07 Aug 2025	2.80%	High Reasoning Effort	Yes	Source
OpenAI	GPT 4.1 Mini	14 Apr 2025	1.80%	-	Yes	Source
OpenAI	GPT 5 Mini	07 Aug 2025	1.30%	High Reasoning Effort	Yes	Source
OpenAI	GPT 5	07 Aug 2025	1.20%	High Reasoning Effort	Yes	Source
OpenAI	GPT 4.1	14 Apr 2025	1.10%	-	Yes	Source