Twelve months ago, the industry was betting on which AI platform would win discovery. Perplexity looked like the search-native challenger. Copilot looked like the enterprise Trojan horse. Neither bet paid off.
Previsible (disclosure: I’m its CPO and co-founder) just published its third AI Traffic Study, analyzing 6.77 million LLM-driven sessions. The data shows consolidation. Monthly LLM sessions grew 9.9x, reaching 644,478 in May 2026. And 92.4% of that traffic comes from one platform.
The plateau was a pause
In mid-2025, AI traffic appeared to be peaking in some sectors. It wasn’t.
Sessions rose from 65,249 in November 2024 to 396,278 by August 2025, then dropped sharply in November 2025, before hitting new highs of 428,203 in February 2026 and 644,478 in May.
That November dip needs context.
Sessions fell 50% in one month, driven almost entirely by ChatGPT referrals dropping from 448,412 to 213,345. Other platforms held steady. This was likely a model-related change; we’ve seen modest product tweaks massively swing referral traffic, like last fall when many sites lost half their ChatGPT traffic because the model began favoring Wikipedia and Reddit. Sessions recovered to 442,609 by December.
The lesson: one vendor’s product decisions can halve your AI traffic overnight. Plan for the volatility.
Consolidation, not competition
When we last published in December 2025, ChatGPT held roughly 84% share, followed by Perplexity at 8.9%, Gemini at 4.5%, Copilot at 2.1%, and Claude at 0.6%. Six months later, the field has collapsed toward the leader.
Across the full dataset, ChatGPT commands 92.4% of trackable LLM referral traffic, growing 12.8x over 19 months with no sign of slowing. It’s the only LLM sending meaningful referral volume at scale. Optimizing for “AI visibility” without prioritizing ChatGPT means optimizing for an abstraction.
Important framing: this measures standalone LLM referral traffic. AI discovery inside Google’s own results, including AI Overviews, almost certainly drives more AI traffic than all standalone platforms combined, but it operates on a different measurement paradigm and is excluded here.
The challengers flipped
The surprise isn’t at the top. It’s who’s moving underneath.
Claude
Claude grew 64x, from 133 sessions in November 2024 to 8,528 in May 2026, and overtook Perplexity in March 2026 for the first time. It stayed ahead.
Claude was flat through 2025, then accelerated 4x in two months as its agentic tools and enterprise integrations gained adoption. The enterprise advantage the industry expected Copilot to win may be materializing for Claude instead.
If your audience includes technical buyers, developers, or professional services, Claude visibility is now material, and the window for early positioning is open.
Gemini
Gemini is the quiet number two: 3.2x growth with almost no volatility. Its Workspace and Android integration mean…
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