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TechRadar
TechRadar
Graham Barlow

New tests show ChatGPT-5 is more accurate than GPT-4o – Grok still struggles with hallucinations

Grok OpenAI Sam Altman Taylor Swift
ChatGPT-5.
  • ChatGPT-5 scores a low 1.4% on the Hallucination Leaderboard
  • This puts it ahead of ChatGPT-4 which scores 1.8% and GPT-4o, which scores 1.49%
  • Grok 4 is much higher at 4.8%, with Gemini-2.5 Pro at 2.6%

Sam Altman, OpenAI CEO, launched ChatGPT-5 on Thursday as the most “powerful, smart, fastest, reliable and robust version of ChatGPT that we’ve ever shipped”, and in the presentation, OpenAI staff also emphasized that ChatGPT-5 would “mitigate hallucinations”.

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