ChatGPT Using Google Search Index
Briefly

Recent tests indicate that OpenAI's ChatGPT might be using Google Search's index to provide answers. Abhishek Iyer created a new, previously unindexed page, then used Google Search Console to force it to be indexed. ChatGPT quickly recognized this page. Similarly, Aleyda Solis conducted an experiment confirming that when she created unindexed content, it appeared on ChatGPT after Google indexed it. Both cases suggest that ChatGPT may rely on Google's search results rather than its presumed Bing integration.
Abhishek Iyer demonstrated that ChatGPT quickly identified a newly created webpage that wasn’t indexed by other search engines, suggesting its dependency on Google.
Aleyda Solis confirmed through her test that ChatGPT utilizes Google SERP snippets for answers, revealing potential reliance on Google's indexing.
Read at Search Engine Roundtable
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