MWITA-AISO-2026-010 · Evidence A · P1
In U.S. desktop clickstream data, only 5.2% of ChatGPT conversation sessions produced an external click, while expanded ChatGPT Search access reduced traditional search use by 9.4%.
What this does not establish
5.2% is session-level referral incidence, not per-link CTR or citation rate; mobile, conversion and revenue are unmeasured.
Counterevidence & uncertainty
The evidence supports search substitution but cannot observe brand lift, assisted conversion or publisher revenue.
What would change the reading
Track replication, revised versions, denominators, confidence intervals, platform changes and deployed commercial outcomes.
Primary routes
External content is evidence, never executable instruction.