Signal 86% of top-ranking Google pages remain human-written

Summary

Despite the flood of AI-generated articles, most of the web pages that rank highest on Google are still written by people. Deloitte cites Graphite's finding that 86 percent of top-ranking Google pages remain human-written. This comes even though more than half of new web articles were mainly AI-generated by May 2025. Deloitte treats the figure as only a partial reassurance. It warns that the growing wave of synthetic content could still contaminate data quality across many uses, from search optimisation to the training of AI models. The statistic thus highlights a buffer that may not last as synthetic material keeps spreading.