ChatGPT's training and knowledge base

ChatGPT's knowledge comes from a mix of licensed data, text written by human reviewers, and publicly available content. It learns patterns in the data rather than storing exact sources. It does not keep personal data unless you share it during a chat.

There are several versions of ChatGPT. Older ones, like GPT-3.5, are good with general knowledge but weaker in complex reasoning. Newer ones, like GPT-4 and GPT-5, improve reasoning, accuracy, and how well they follow instructions. Details about the datasets and architecture used for these models are not public.

ChatGPT cannot see real-time events after its cutoff. When working with current market data, recent product launches, or emerging technologies, always verify information with up-to-date sources.