OpenAI claims its newest chatbot GPT-4.5 should ‘hallucinate less’. How is that measured?

OpenAI claims its newest chatbot GPT-4.5 should ‘hallucinate less’. How is that measured?
The next most recent GPT model, GPT-4o, hallucinated 62 per cent of the time. But Daswin de Silva, an AI researcher at La Trobe University, says …

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