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How does ChatGPT maintain context in conversations?

Updated May 15, 2026

Short answer

ChatGPT maintains context by processing previous conversation messages as part of the input prompt.

Deep explanation

ChatGPT does not have persistent memory by default. Instead, it uses a context window that includes previous messages in the conversation. The transformer model uses self-attention to relate current input tokens with earlier tokens in the context window.

Real-world example

Customer support bots keep conversation history to answer follow-up questions.

Common mistakes

  • Assuming ChatGPT remembers past chats permanently.

Follow-up questions

  • What is context window size?
  • What happens when context is too large?

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