Rates of "oh," "okay," and "uh-huh" per 100 words. Credit: Cognitive Science (2025). DOI: 10.1111/cogs.70106 Large language models like ChatGPT and Copilot are useful for many things. However, they are not yet good enough to imitate the way people speak. It is easy to be impressed by artificial intelligence. Many people use large language models such as ChatGPT, Copilot and Perplexity to help solve a variety of tasks or simply for entertainment purposes. B