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Daily SEO Brief

Sunday, October 18, 2026

1 article published

What You Need to Know

A recent study from the National University of Singapore and Xi’an Jiaotong University examined the citation patterns of OpenAI's ChatGPT and its API, revealing that while the API cited more pages overall, Google search results played a minimal role in those citations. This behavior suggests potential implications for SEO strategies as ChatGPT’s search mechanism adapts queries and alters source material between interactions.

Must-Read Highlights

1

The study found that Google search results contributed only 9.4% and 6.4% to the pages cited in ChatGPT's responses.

OpenAI’s API Only Partly Matched ChatGPT’s Citations, Paper Finds
2

The OpenAI API accounted for a larger share of the pages cited in ChatGPT's responses, indicating a significant overlap in sources.

OpenAI’s API Only Partly Matched ChatGPT’s Citations, Paper Finds
3

ChatGPT's search mechanism was found to rewrite queries and alter the sources used, suggesting an adaptive search behavior.

OpenAI’s API Only Partly Matched ChatGPT’s Citations, Paper Finds
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The findings indicate that users may receive varied information with repeated queries, affecting the consistency of SEO results.

OpenAI’s API Only Partly Matched ChatGPT’s Citations, Paper Finds
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As the behavior of AI tools like ChatGPT evolves, SEO strategies may need to adapt to manage shifting citation patterns.

OpenAI’s API Only Partly Matched ChatGPT’s Citations, Paper Finds

All Articles from This Day

OpenAI’s API Only Partly Matched ChatGPT’s Citations, Paper Finds via @sejournal, @MattGSouthern
SEJ
Oct 18, 2026•Matt G. Southern
High Importance

OpenAI’s API Only Partly Matched ChatGPT’s Citations, Paper Finds via @sejournal, @MattGSouthern

AI Analysis
  • ●Research from the National University of Singapore and Xi’an Jiaotong University analyzed data flow and citations from various versions of ChatGPT, highlighting the percentage of cited pages versus sites in responses.
  • ●The study found that Google search results contributed only a small percentage (9.4% and 6.4%) to the pages cited, while the OpenAI API accounted for a larger share, demonstrating a significant overlap in sources when queries were run on ChatGPT.
  • ●Notably, ChatGPT's search mechanism was found to rewrite questions and alter the sources used between different runs, indicating an adaptive search behavior that may influence SEO strategies.
Why it matters: The insights on how ChatGPT uses web sources and the implications for SEO professionals present crucial information on AI's impact on search engine strategies.
ChatGPTSEOAISearch Engine ResultsRanking Factors
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