ChatGPT vs Perplexity vs Google AI Overviews: how each one picks sources

"Optimise for AI search" isn't one job — it's several, because ChatGPT, Perplexity, and Google AI Overviews each decide what to cite in meaningfully different ways. Treating them as one target usually means optimising for none of them well.

ChatGPT

When ChatGPT browses the web (via Bing's index under the hood for many queries), it tends to favour pages with clear, extractable answers near the top, strong topical authority, and recent publication or update dates. It's also more likely to cite a specific, narrowly-scoped page than a broad category page — specificity reads as expertise.

Perplexity

Perplexity is the most citation-heavy of the three, typically showing multiple numbered sources per answer. It rewards pages that are easy to quote directly — short, factual passages with minimal fluff — and appears to weight freshness and source diversity noticeably higher than the others, often pulling from forums, review sites, and niche publications alongside company pages.

Google AI Overviews

Because it's built on Google's existing index and ranking signals, AI Overviews leans heavily on traditional SEO fundamentals — backlinks, domain authority, structured data — layered with answer-extraction logic similar to Featured Snippets. Sites that already rank well organically have a real head start here, but still need answer-shaped content to actually get pulled into the overview box.

What this means in practice

• Don't chase one platform exclusively. A page built only for Google AI Overviews (backlink-heavy, authority-driven) may never surface in Perplexity, which favours freshness and directness over domain authority.
• Keep answers extractable everywhere. Short, direct, well-labelled answers near the top of a page perform across all three, even though the ranking logic underneath differs.
• Track citations per platform, not as one number. A business can be well-cited in Perplexity and invisible in Google AI Overviews at the same time — the monthly report should show both.

The platforms will keep evolving individually. The businesses that stay visible are the ones treating each one as its own distribution channel — not a single "AI SEO" checkbox.