Ahrefs found that 50 to 83% of site links vanish from AI service responses within a day. Around three-quarters of those lost links return within 20 days. Tracking a single appearance or disappearance is noise, not a visibility metric.
Why links disappear and reappear
ChatGPT generates a new answer to each query, and the links it cites shift accordingly. One reason: ChatGPT rewrites user questions into search queries, and these rewrites vary. Ahrefs data showed identical searches repeated in only 26% of cases. If account memory is enabled, ChatGPT factors saved user data into query rewriting. Google results also depend on location, language and device—all of which affect outcomes.
A link vanishing from an answer almost never signals a site problem. To rule it out, check site availability, recent edits and pages blocked from search crawlers.
Measuring visibility correctly
ChatGPT visibility equals k/n: the question asked n times, the site cited in k answers. Ten responses give visibility with an error margin of tens of percentage points. The margin is a confidence interval—the range where the true share lies at 95% confidence. Example: the site appears in 3 of 10 answers, or 30%, but the interval spans 11 to 60%.
For reporting, use this scheme: 10 question repeats per measurement, one measurement per week, a window of four recent measurements (40 answers total). More answers narrow the interval. At 40 answers with the same 30% share, the interval shrinks to 18–45%.
Track two metrics at once: site links and brand mentions. Ahrefs found they behaved differently. In 12–16% of cases the link disappeared while the mention stayed; in 9–12% the reverse occurred.
When to call a site lost
A site counts as gone only after two consecutive measurements where the new interval's upper bound falls below the four prior measurements' lower bound. One weak measurement means nothing.
Declare a loss after three weeks without return. This timeframe comes from Ahrefs data: about 75% of lost citations returned within 20 days. New links are fragile—roughly 70% vanish the next day, with only 34–45% of those returning. An established link that held for 8 days or longer came back in 96–99% of cases.
Reporting to clients
Show clients the appearance share over the last four measurements with confidence intervals, plus month-to-month change. Example: the site appears in 30% of answers (18–45%); a month ago it was 20% (11–35%). The intervals overlap, so growth from 20 to 30% may be random—tell the client this upfront. Brand ranking in the response list should be reported separately from appearance share: a brand may appear in most answers but rank first in only a fraction.
