# How AI engines actually decide what to cite (ChatGPT, Perplexity, Gemini, AI Overviews) > Source: > Published: 2026-06-21 05:19:39+00:00 Everyone keeps asking "is SEO dead." Wrong question. AI search doesn't show ten blue links. It generates one answer and names a few brands. If you're not in that answer, you don't exist for that query. So the real question is: how do these engines decide who to name? I went down a rabbit hole on how four of them actually retrieve and cite sources. Here's what's true in 2026, with real numbers. ChatGPT answers in two modes. Default mode answers from trained-in memory, no live web. Search mode browses and attaches citations. The key fact: when it browses, it cites only about **15% of the pages it pulls** (AirOps study of 548k pages). And it names brands roughly 3x more often than it links them. So two things get you in: Perplexity does live retrieval and grounds every answer in sources. Its defining trait: it leans on community content hard. One 2025 study found **Reddit was its most-cited source, ~47% of top citations**. It also rewards answer-first pages, because its reranker scores for how cleanly it can extract a passage. A page can rank #1 on Google and never get cited here if the answer is buried. Gemini is the only major assistant running on Google's own live index plus the Knowledge Graph. So classical SEO is the floor, not optional. The twist: ranking #1 isn't enough anymore. Only about **38% of Google's AI Overview citations come from the top 10 results, down from ~76% a year earlier.** It pulls from deeper now, via sub-queries. AI Overviews uses "query fan-out" - it splits your question into 8-12 sub-queries and pools the results. Most citations come from **below position #1** (roughly 63% from below the top 10). And counterintuitively, it has the **weakest freshness bias** of the major engines. Established, authoritative pages keep getting cited even without recent updates, which is the opposite of ChatGPT and Perplexity. I got tired of checking this by hand, so I built [FixAEO](https://fixaeo.com/) - a free tool to see how AI engines describe and recommend your brand across 8 engines, plus a free [llms.txt validator](https://fixaeo.com/llms-txt-validator/). Sharing in case it saves you the manual prompting. What have you noticed about getting cited by AI? Curious if others are seeing the same patterns.