OpenAI’s newest o3 and o4-mini models excel at coding and math – but hallucinate more often
Syndication 
Historically, each new generation of OpenAI’s models has delivered incremental improvements in factual accuracy, with hallucination rates dropping as the technology matured. However, internal testing and third-party evaluations now reveal that o3 and o4-mini, both classified as “reasoning models,” are more prone to making things up than earlier reasoning models…
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