How Google AI Overviews, ChatGPT, and Perplexity rank content differently

Executive overview

Treating AI search as a single channel is a mistake. Each major platform — Google AI Overviews, Google AI Mode, ChatGPT, and Perplexity — pulls from different sources, with only 14% overlap among the top 50 cited domains across platforms.

Optimizing for one platform without understanding the others means leaving visibility on the table.

Each AI search platform is its own ecosystem with its own index, biases, and source preferences.

Platform source preferences

• Google AI Overviews favor authoritative, established sites: health, finance, encyclopedic content, YouTube, Reddit
• YouTube accounts for ~5.6% of all AI Overview citations — and that share is growing
• ChatGPT skews heavily toward high-authority publishers; median domain rating of top-cited pages is 90
• OpenAI licensing deals with outlets like Forbes, Wired, and Business Insider reinforce this bias
• Perplexity is the most aligned with traditional Google search — 28.6% of its citations come from Google's top 10
• Google AI Mode and AI Overviews share only 13.7% citation overlap, despite answers being 86% semantically similar
• AI Mode cites YouTube far more than Overviews, and pulls more heavily from Quora, Facebook, and Instagram

Where to focus first

• Google AI features and ChatGPT account for the vast majority of AI search traffic; Perplexity is still a fraction
• If already ranking well in Google, Perplexity offers the most immediate AI visibility gain
• The link between Google rankings and AI Overview citations is weakening: top-10 overlap has dropped from 76% to ~38%
• AI Overviews increasingly pull from outside the top 10 — YouTube and Reddit in particular
• For ChatGPT visibility, editorial mentions on high-DR publisher sites matter more than your own page's Google ranking
• Many top-cited AI search domains receive no traditional search traffic at all

Practical prioritisation

• No need to build completely separate strategies — quality content, topical authority, and earned mentions help across all platforms
• If ChatGPT drives traffic in your niche: target high-DR editorial sites and publishers
• If AI Overviews matter more: prioritise YouTube and Reddit presence
• Use tools like Ahrefs' Brand Radar (cited domains report, filtered by platform) to see where your brand appears on each platform