gpt-5-thinking has a hallucination rate 65% smaller than OpenAI o3.
gpt-5-main outperforms GPT-4o in illicit/nonviolent and illicit/violent categories.
gpt-5-main achieved a 44% reduction in responses with major factual errors compared to GPT-4o.
Overall safety scores improved for gpt-5-thinking compared to OpenAI o3.
gpt-5-main underperformed OpenAI o4 in non-violent hate and harassment/threatening categories.
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