What is ChatGPT? – OpenAI Help Center

July 30, 2025

ChatGPT is fine-tuned from GPT-3.5, a language model trained to produce text. ChatGPT was optimized for dialogue by using Reinforcement Learning with Human Feedback (RLHF) – a method that uses human demonstrations and preference comparisons to guide the model toward desired behavior.

https://help.openai.com/en/articles/6783457-what-is-chatgpt

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