GPT-4 is the latest release of artificial intelligence technology that has stunned researchers with its capabilities. Language transformer models like GPT-4 and Bing AI are capable of conversations that feel like talking to a human, and image diffusion models such as Midjourney and Stable Diffusion produce digital art that looks better than most humans can produce. ChatGPT, which implements GPT-4, is publicly accessible and can be used to test the claims of public intellectuals such as Gary Marcus, Judea Pearl, and Noam Chomsky that the models lack causal understanding.