An Ahrefs study of 331,000 top-ranking pages found that human-led content still dominates search, with 82.2% of top-3 rankings held by pages under 50% AI. But fully AI pages can rank too. The signal Google rewards is quality, not the tool that made the page.
Google is not running an AI detector. It is running a quality filter, and it always was.
Ahrefs looked at the pages that actually rank and settled a long argument. Google does not punish content for being written by AI. It punishes content for being bad.
The study pulled a million pages from the top 10 positions across 100,000 search results in June 2026, then ran AI detection on the ones with enough content to analyse, roughly 331,000 pages. The headline finding is blunt. Over half of top-ranking pages, 54.7%, are less than 20% AI. Pages under 50% AI make up 82.2% of all top-3 rankings. Human-led content still dominates the top of the results.
But the door is not shut on AI. Fully AI-generated pages can and do rank, with 9% of top-ranking pages being 80% or more AI, and 5.3% being fully machine-written. On indexation, 40% of heavy-AI pages still got indexed, not far off the 49% rate for low-AI pages.
Why it matters
A lot of businesses either swore off AI content out of fear or flooded their sites with it hoping for a shortcut. Both misread the game. The signal Google cares about is whether the page is useful, original and worth a reader's time. AI can help you get there faster or it can help you produce more rubbish faster. The tool is not the problem. The output is.
Share of top-3 Google rankings held by pages that are less than 50% AI-generated (Ahrefs, 331k pages studied)
This lines up with what we see when we score businesses. The ones getting punished in search are not being caught for using AI. They are being caught for thin generic pages that say nothing a hundred other pages have not already said.
What to do about it
Write for the person, not the algorithm. That advice was true before AI and the data says it is still true now.