Haus asked Perplexity’s sonar and sonar-pro 310 questions about technology companies and grepped each cited page for the sentence’s own figures. Of 1,826 numeric citations, 34.7% pointed at a page that would not open or contained none of those figures. Per claim, 14.4% of 872 still fail if any one page carrying one figure counts as a pass. On sonar’s 2,915 unique cited URLs, 1.3% were dead. The citation failures are mostly gated pages and live pages that do not say it.

Same day, Trellner kept the URLs those models retrieved for 380 “best software” questions. Three sites registered December 2023 through May 2024 have published 215,128 generated /best/...-software/ pages. Two of the homepages title themselves “Facts & Grounding Page”.

I read both reports. I fetched four pages they name. worldmetrics.org and gitnux.org still title themselves Facts & Grounding Page. en.wikipedia.org/wiki/Docker,_Inc. still has no 3790 El Camino and no 94306. vercel.com/docs/plans returns 200 and names Hobby; the eleven $20 hits in the HTML are Next.js "$20" element IDs, not a price. Visible text has none of $20, $20/month, or 20/month. I did not rerun the audits.

A live [n] is not a source receipt.