More than half of content on internet now written by AI, up from 0 when ChatGPT was launched

More than half of the newly published online content since the beginning of January 2025 was generated by AI, revealed Stanford's AI Index Report 2026. AI-written content has surged to 51.72% in 2025, up from zero in November 2022 when ChatGPT was launched. Many companies have explored publishing content generated by ChatGPT and Claude to grow their traffic, it added.