>ChatGPT is a dialog AI,

OpenAI doesn't even call chatGPT AI or dialog AI.

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>Non task-specific problem solving at the level of a human. The boundary between advanced AI, especially multi-task learning models, and AGI will get smaller and fuzzy in the coming decades, but there is a difference.

That is closer to the original older definition of AI, I don't think I've seen one credible definition that doesn't include problem solving. AGI just started getting used because AI had been used to much to refer to stuff that isn't AI.