Profound (Aug 2024-Jun 2025, 680M citations): only 11% domain overlap between ChatGPT and Perplexity; 13.7% between AI Overviews and AI Mode

Claim: Profound's analysis of 680 million citations (Aug 2024 – June 2025):

• "Only 11% of domains are cited by both ChatGPT and Perplexity"
• Google AI Overviews and Google AI Mode cite the same URLs only 13.7% of the time

Source: https://www.tryprofound.com/blog/ai-platform-citation-patterns

Confidence: Verified.

Companion citation behavior data (Qwairy Q3 2025):

• Perplexity averages 21.87 citations per response
• ChatGPT averages 7.92 citations per response
• https://www.qwairy.co/blog/provider-citation-behavior-q3-2025

Companion freshness finding (Whitehat SEO 2026):

• "Content updated within 30 days earns 3.2× more AI citations across platforms"
• Perplexity is the most freshness-sensitive (82% citation rate for 30-day content vs 37% for older)
• https://whitehat-seo.co.uk/blog/ai-engines-comparison-citations

The strategic read: AI citation rewards proprietary data on top of public sources. Perplexity in particular favors "visible statistics and proprietary data, named sources with verifiable methodology" (Leapd 2026). A normalized open-data dashboard surfaced as a public page hits all three — see RULE: Build Candid client data products on official open-data feeds — never on scraped sources.