A key limitation of certain AI models, including ChatGPT, is they are trained on data that’s a year or two old. (At least, the ones that can't connect to the internet.) They can’t give you the latest insights from new scientific papers, or even chatter on Reddit.
Perplexity has its own search engine that delves into the web and scrapes the latest information. Then it does something even better: When it provides you with that information, it cites the sources, like a reliable search engine would
That way you can determine whether they are likely to be trustworthy without doing the extra legwork of directly verifying every fact and figure.
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How Perplexity AI Stands up to Google and ChatGPT
https://lifehacker.com/tech/perplexity-ai-versus-google-and-chatgpt