UGC Platforms AI visibility trends show how entity AI Index scores have moved across 10 completed public ChatGPT leaderboard snapshots from May 16, 2026 to Aug 12, 2026.
YouTube leads the latest ChatGPT snapshot with a 90 AI Index and 100% mention rate.
YouTube is down 1.9 AI Index points across the visible window, moving from 91.9 to 90 on ChatGPT.
The chart currently compares Substack. Use the entity filters to separate durable visibility trends from one-off ranking movement in a single AI engine.
Read this trend alongside the main UGC Platforms leaderboard and entity pages: the trend view explains historical movement, while ranking pages show the latest cross-entity position, mention rate, and score gap.
Substack ranking and static AI visibility queries should use the base entity page. This trend page is for Substack AI visibility trend, ranking history, and movement over time.