AI Search: Perplexity, Google AI Mode, ChatGPT Search — 2026-09-02

Top developments

Google AI Overviews Reach 75% Coverage Milestone

Data from Xponent21 reveals that Google’s AI Overviews are now displayed in 75% of search queries, a figure reached four months earlier than predicted. This rapid expansion means three out of every four searches now return an AI-generated summary, fundamentally altering how users interact with search results. For publishers, this shift accelerates the decline of traditional organic clicks as AI answers satisfy user intent directly within the SERP.

Britannica Joins Legal Battle Against Perplexity

Encyclopedia Britannica and Merriam-Webster have filed copyright lawsuits against Perplexity AI, alleging unauthorized use of their content to power generative responses. This move follows similar actions by The New York Times and CNN, signaling a coordinated legal front by major content holders against AI search engines that scrape proprietary data without licensing agreements. The case highlights the growing tension between AI model training needs and intellectual property rights.

Perplexity Expands Beyond Cloud with Local AI Focus

Perplexity is reportedly developing capabilities to run AI models locally on devices, moving beyond its cloud-centric architecture. This strategic pivot aims to address privacy concerns and reduce latency, potentially allowing users to process sensitive queries offline. Amidst rumors of an Nvidia partnership, this development could differentiate Perplexity from competitors like Google and OpenAI, which remain heavily reliant on centralized server infrastructure.

Google August Spam Update Targets AI Content Abuse

Google rolled out its August 2026 Spam Update, specifically targeting "scaled content abuse" and low-quality AI-generated material. Case studies indicate significant traffic losses for sites relying on thin, programmatic, or affiliate-heavy AI content. This update reinforces Google’s stance against spammy AI outputs while simultaneously pushing legitimate publishers to adapt their strategies for AI Overviews visibility.

Local view

German media outlet etailment reports that Google is expanding the real estate for AI Overviews, removing the "Show more" button for certain queries to display full-length AI answers immediately. This change pushes traditional search links further down the page, exacerbating the "zero-click" problem for German publishers who rely heavily on search referral traffic.

Context & numbers

• AI Overview Penetration: 75% of Google searches now trigger AI Overviews.
• CTR Decline: Ahrefs data from early 2026 indicated a 58% drop in click-through rates for URLs appearing in AI Overviews compared to traditional blue links.
• Referral Traffic: Chartbeat reports a 33% decrease in search engine referrals to publishers worldwide due to AI answer engines.
• ChatGPT Citations: Reddit’s share of ChatGPT citations dropped by 86% in mid-August 2026, falling from ~3.8% to under 1%, likely due to platform-specific blocking or algorithmic shifts.

On the radar

• UK CMA Review: Independent publishers are urging the UK Competition and Markets Authority (CMA) to rethink proposed rules for Google AI Overviews, arguing they fail to address "two-sided market" competition concerns.
• News Corp Litigation: News Corp CEO Robert Thomson has vowed further lawsuits against AI companies, specifically naming Perplexity and Brave, potentially targeting end-users of these platforms.