# Ahrefs' 66.6-million-response study finds most free ChatGPT answers never search the web Ahrefs reports that just 14.4% of 66.6 million free, logged-out GPT-5.6 Luna responses triggered web search in August–September, and searching responses averaged 1.6 fan-out queries. The sample is large but not representative of paid or reasoning modes. New AI-search data highlight the value of original product information while showing why one-size-fits-all GEO advice is risky. - Status: Active - Published: 2026-10-13T06:18:04+13:00 - Updated: 2026-10-13T06:18:04+13:00 - Categories: Marketing & Distribution, SEO & Search, GEO & AI Search - Tags: Ahrefs, AI search, ChatGPT, ChatGPT Search - Canonical HTML: https://beyondthe.news/dossiers/ahrefs-chatgpt-66m-responses-fanout-search-2026 ## What changed On October 12, 2026 Ahrefs published a proprietary study of 66.6 million free logged-out GPT-5.6 Luna responses and 15 million fan-out queries collected in August–September. It found 14.4% of responses used web search, averaging 1.6 queries among responses that searched. The site: operator appeared in 6.8% of fan-out queries, with official brand domains prevalent among the most frequently searched sites. A separate US citation sample showed large declines in Reddit citations and greater representation of original information sources. ## Why it matters Publishers and SaaS operators should not assume every AI answer fetches live pages, or that generic content-optimisation tricks drive citations. Accessible first-party pricing, specifications, original research and product documentation are more defensible investments, but this one free logged-out model sample cannot be generalized to all paid, logged-in or thinking workflows. ## Most responses in this sample never searched Ahrefs measured web search in 14.4% of 66.6 million responses. The 1.6 average applies only to responses that searched. The 15 million fan-outs are queries, not people or referrals; this is a proprietary sample of a single model and mode. ## The queries increasingly seek first-party facts Of all fan-outs, 6.8% contained site: operators. Among the most frequently searched domains, brand sites predominated. The term price rose from 6.04% of August queries to 8.88% in September. That is observed query behaviour, not proof that every first-party page will rank. ## A separate citation dataset finds large shifts Ahrefs' US Brand Radar citations across 2.4–3.8 million monthly answers suggest Reddit citations fell 88% between March and September, while research bodies, regulators, brands and hands-on testers gained. A roughly 25,000-prompt overlapping subset preserved the directional change, but causation is not established. ## Independent trackers observe different averages Promptwatch independently tracks fan-out and reported around one to two queries per response in parts of 2026, but other studies using commercial or reasoning prompts find many more. Sampling, model version and logged-in state matter; cross-study figures are not interchangeable. ## What builders should measure Keep first-party facts, current pricing, documentation and original evidence discoverable. Track representative commercial prompts and real referrals, not citation counts alone. Treat changes in AI-search behaviour as time-sensitive and model-specific. ## Key details - Published October 12, 2026; sample covers August–September. - 66.6 million free logged-out GPT-5.6 Luna responses; 15 million fan-out queries. - 14.4% triggered web search; searching responses averaged 1.6 queries. - 6.8% of fan-outs used site: operators. - Price term share increased from 6.04% to 8.88% between August and September. - Separate US citation dataset reports Reddit citations down 88% from March to September. - Ahrefs' proprietary data are not independently audited and do not represent all ChatGPT modes. ## Builder takeaways - Do not equate every ChatGPT answer with live search. - Publish first-party product facts, original tests and accurate pricing. - Segment AI-search measurement by prompt intent and model mode. - Use referrals and business outcomes, not only citation share, to judge visibility. ## What to watch - Independent replication in paid and reasoning modes. - Changes in site: and original-source citation trends. - Whether AI-search citations translate into qualified referrals. ## Uncertainties - Ahrefs' sampling and collection cannot be independently audited from its report. - Fan-out and citation statistics use different datasets. - Model behaviour changes frequently; these results are not future guarantees. ## Sources - [How ChatGPT Does Query Fan-Out (15 Million Queries Studied)](https://ahrefs.com/blog/query-fan-out-chatgpt/) — Ahrefs · primary · 2026-10-12T00:00:00+13:00. Original study and methodology; vendor-reported figures. - [How ChatGPT Searches the Web in 2026](https://promptwatch.com/blog/how-chatgpt-searches-the-web) — Promptwatch · independent · 2026-09-25T00:00:00+12:00. Independent, non-identical tracking context with sampling caveats.