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How ChatGPT and other AI chatbots answer your question

A chatbot such as ChatGPT does not look up your answer. It writes the answer one small piece at a time, and each piece is a guess. That is why a chatbot can sound sure and still be wrong. On its way to an answer, your question meets a hidden system prompt, tokens, embeddings, attention, the transformer, and billions of parameters set by training. Then come sampling, chatbot memory and the context window.