
How Perplexity’s Citation Algorithm Differs From ChatGPT’s for UK Queries
ChatGPT and Perplexity share only about 11% of cited domains. Three levers, retrieval, recency and source-type, explain why the same UK query returns different sources.

ChatGPT and Perplexity share only about 11% of cited domains. Three levers, retrieval, recency and source-type, explain why the same UK query returns different sources.

Ranking in ChatGPT means being cited inside its answers, not holding a link. Here are the seven proven GEO tactics that lift AI citations, with the research.

We synthesised public ChatGPT prompt-leak reporting, peer-reviewed retrieval research and our 50-query AiBoost behaviour test into a single 14-factor map with confidence scores. 5 high-confidence, 6 medium, 3 low.

We mapped 12 ranking signals against classic SEO and generative engine optimisation. 5 transfer cleanly, 4 do not, and 3 flip. Anchored to Ahrefs 2025, Profound 2025, arXiv 2024 and AiBoost UK panels.

We re-tested the Ziptie (2025) finding that 44.2% of LLM citations come from the first 30% of a page, against 100 UK commercial pages. The UK panel pushed the figure to 47.3%. Layout, not just content, governs citation.

AI Overview citations from top-10 ranking pages collapsed from 76 percent to 38 percent in 7 months (Ahrefs, March 2026). Microsoft just shipped citation share as a Bing Webmaster Tools metric. Here is the three-metric KPI framework that replaces rank position for AI traffic.

Ahrefs analysed 17 million AI citations and found the average ChatGPT-cited page is 958 days old vs 1,432 days for Google SERP. Here is the three-tier refresh cadence that captures that 33 percent gap, with a worked example for a 50-page UK service site.

Structured data improves AI search visibility by giving AI systems a machine-readable map of your content. Instead of relying on AI to infer meaning from.

28% of consumers now use ChatGPT or Perplexity when researching solicitors, accountants, and consultants.

50% of AI-cited content is less than 13 weeks old (Ahrefs, 2025).