The record
German SEO toolmaker whose 17-week, 1.5-million-snapshot study is the record's base rate for citation drift.
One item, and the record's base rate for citation drift: SISTRIX re-sampled 82,619 prompts weekly for 17 weeks — 1,548,213 snapshots across six countries and three surfaces — and found Google replacing 56% of its cited sources every week and ChatGPT as much as 74%, with a stable core of a few domains on 86% of prompts and 89% weekly rotation outside it. AI Overviews and AI Mode cited different domains 83% of the time; only 1.4% of cited news articles stayed permanently. Vendor-published and not replicated.
1 item on the wire, newest first. Elsewhere: official
The largest public measurement of citation drift re-sampled 82,619 prompts weekly for 17 weeks, from December 17, 2025 to April 8, 2026, producing…
