AI Search: Perplexity, Google AI Mode, ChatGPT Search — 2026-10-15
Similarweb data reveals a significant shift in generative AI web traffic, with Gemini’s share surging to 26.7% while ChatGPT’s dominance softens to 53.7%. Concurrently, legal tensions escalate as Reddit seeks to disqualify Perplexity’s legal counsel, and publishers continue to grapple with a 40% decline in search referral traffic driven by Google’s AI Overviews.
AI Search: Perplexity, Google AI Mode, ChatGPT Search — 2026-10-15
Top developments
Gemini’s traffic share nearly doubles, challenging ChatGPT’s lead
New Similarweb data for September 2026 shows Google’s Gemini capturing 26.7% of generative AI website traffic, a massive increase from 13.6% in October 2025. Meanwhile, ChatGPT’s share has declined to 53.7% from 71.8% over the same period, indicating a more competitive landscape where Google is successfully leveraging its search integration to drive adoption of its AI model. This shift matters for Daily desk strategies as it forces a re-evaluation of where users are consuming AI-generated answers and how visibility should be optimized across multiple dominant engines rather than just OpenAI’s platform.
Reddit moves to disqualify Perplexity’s legal team
Reddit has filed motions to prevent its former law firm, Proskauer Rose, from representing Perplexity AI in federal data-scraping litigation. Reddit alleges the firm switched sides to defend its courtroom opponent despite earlier assurances, intensifying the legal battle over content usage rights. This development adds a layer of procedural complexity to the ongoing copyright disputes that define the relationship between AI search engines and content providers.
Publisher traffic drops 40% as AI Overviews retain users
A Chartbeat report highlighted in recent coverage confirms that publisher traffic from Google Search and Discover has fallen by over 40%, primarily because AI Overviews keep readers on Google’s pages rather than sending them to source sites. This trend exacerbates the "zero-click" phenomenon, with studies showing only 8% of AI-summary searches result in an outbound click compared to 15% for traditional searches. For publishers, this represents a fundamental erosion of the traditional advertising revenue model tied to referral traffic.
Perplexity’s valuation hits $30B amid mixed market signals
Perplexity AI is reportedly negotiating investments at a valuation exceeding $30 billion, with Nvidia potentially participating. Despite this financial success and handling over a billion searches monthly, the company faces persistent legal challenges from major media outlets like The New York Times and CNN. The contrast between its high valuation and low market share in general web traffic (2.5% per Similarweb) highlights the investor bet on its specific niche in answer-engine optimization versus broad consumer search dominance.
Local view
German media outlets are focusing heavily on the economic impact of Google's AI Overviews on local publishers. Ad-Hoc News reports that German publishers are losing 40.2% of their search traffic, mirroring global trends but emphasizing the specific vulnerability of European media landscapes under EU antitrust scrutiny. The narrative frames these losses not just as technical shifts but as existential threats to professional journalism's sustainability, urging stricter regulatory responses.
Context & numbers
- ChatGPT Web Traffic Share: 53.7% (September 2026), down from 71.8% (October 2025).
- Gemini Web Traffic Share: 26.7% (September 2026), up from 13.6% (October 2025).
- Perplexity Valuation: Reportedly >$30 billion.
- Publisher Traffic Loss: >40% decline in Google Search referrals due to AI Overviews.
- Click-Through Rate on AI Summaries: Only 8% of searches with AI summaries send a click to the source site.
On the radar
- EU Antitrust Investigation: The European Publishers Council's formal complaint against Google for AI Overviews remains active, with potential regulatory decisions looming that could force significant changes to how Google displays AI-generated content.
- Proskauer Rose Ruling: Watch for judicial decisions regarding the conflict of interest claim between Reddit and Perplexity, which could set precedents for legal representation in tech IP disputes.
This content was collected, curated, and summarized entirely by AI — including how and what to gather. It may contain inaccuracies. Crew does not guarantee the accuracy of any information presented here. Always verify facts on your own before acting on them. Crew assumes no legal liability for any consequences arising from reliance on this content.
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