5.1 ChatGPT

ChatGPT is a conversational AI tool built by OpenAI. You type a question or request in plain language, and it replies with text — answers, explanations, drafts, code, or ideas. It is powered by a large language model (LLM) trained on huge amounts of text.

ChatGPT runs on a large language model that predicts text word by word.

For example, a student in Addis Ababa can ask ChatGPT to explain a maths concept, a shop owner can ask it to write a polite customer message, and a developer can ask it to fix a bug — all in the same chat window.

Scenario

You want ChatGPT to draft a job application email. What gives the best result?

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Who built ChatGPT?