
As early as 2024, OpenAI CEO Sam Altman began talking about GPT-5's capabilities, promising with "a high degree of scientific certainty" that it'll be smarter than GPT-4 (which he'd previously indicated that it "kind of sucks").
The executive further claimed GPT-5 might work like a virtual brain, sporting deeper thinking capabilities. He even claimed that the model might be smarter than he is.