> If your experience is with the free version of ChatGPT,

Even the free version of ChatGPT shouldn't hallucinate, after all it uses a good enough model. And the answer is no, it's a combination of paid and free models coming from OpenAI, Claude and Google's Gemini (with this latter one actually badly miss-identifying a WW2 military dictator a couple of weeks ago, wrote about it here [1] )

[1] https://news.ycombinator.com/reply?id=50256321&goto=threads%...