State of Web 2026: How AI Is Reshaping the Internet

Summary

Sensor Tower's State of Web 2026 report reveals that AI assistants have become the fastest-growing web category, with traffic surging 86% YoY. ChatGPT alone added over 60 billion visits and became the #6 most visited site globally. This growth is impacting traditional categories: visits to news and education websites softened as users turn to AI for synthesis.

Mobile accounted for 47.6% of visits in 2025 and crossed 50% in Q1 2026, driven by emerging markets. However, desktop still dominates engagement with over 70% of total time spent. Cross-platform AI usage doubled between early 2024 and late 2025.

The report highlights a battle for discovery: search and social still drive 2.4 trillion annual visits, but time spent on these channels declined (social -1%, search -7%). AI's influence on commerce is evident—Amazon's Rufus shoppers convert nearly twice as often. AI traffic sources remain under 1% of total web traffic but are growing rapidly.

For ad ops, key takeaways include the need to optimize for mobile-first, desktop-engagement duality; to prepare for AI-driven referrals (even if small today); and to leverage AI tools like Rufus to boost conversion. The duopoly of Google and Meta persists but faces emerging competition from AI platforms.

Analyst Note

For ad operations professionals, the key signal here is the emergence of AI assistants as a structurally distinct discovery layer, not merely a new channel. With AI traffic growing 86% YoY and ChatGPT alone becoming the #6 website, the user journey is fragmenting beyond the traditional search-social duopoly. While search and social still command over 2.4 trillion visits, their time spent is declining—a direct indication that AI is capturing engagement, not just clicks.

This matters because conversion and attribution models built on last-click or view-through from Google or Meta are increasingly blind to AI-influenced paths. The rise of cross-platform AI usage (doubled in 18 months) also complicates cohort analysis and frequency capping, as users move seamlessly between browsers and mobile AI apps. For UA managers, the implication is that AI-driven traffic—though currently <1% of total web—carries higher intent, evidenced by Amazon Rufus users converting at nearly double the rate.

Monetization teams should watch for softness in informational categories (news, education) as users substitute browsing with AI synthesis, potentially lowering programmatic CPMs in those verticals. Meanwhile, Alphabet and Meta’s True Audience dominance remains intact, but the duopoly’s grip on discovery is softening. The practical takeaway: cross-platform measurement tools and AI-ready attribution modeling are no longer optional—they are becoming table stakes for understanding the modern web funnel.