For two decades, the implicit contract of search advertising was straightforward: a user types a query, Google displays ten results with ads above them, and the advertiser pays for clicks. The interface was stable. The rules were known. Billions were spent optimising for it.
That contract is being rewritten. Google’s AI Mode — announced at Google I/O in May 2025 and now rolling out globally — is not an incremental update to search. It is a different product built on a different assumption: that users want a synthesised answer to a complex question, not a list of links to explore.
What AI Mode actually is
AI Mode is a dedicated tab within Google Search that delivers a fully conversational AI experience. Users can ask multi-part questions, follow up within the same session, and receive comprehensive answers that draw from multiple sources simultaneously.
Where AI Overviews appear as a box above standard results on regular search queries, AI Mode is an entirely separate interface — closer to ChatGPT in experience, but powered by Google’s Gemini models and integrated with Google’s index of the live web.
The distinction matters for advertisers. AI Overviews ads appear as placements alongside a synthesised box on standard search pages. AI Mode ads, as Google expands the format, will appear within a fully conversational session — a different context, different intent stage, and different creative requirements.
The scale of the shift
AI Overviews already appear on approximately 48% of all Google searches. Google reports that AI Mode is driving a measurable increase in query complexity — users are asking longer, more specific questions than they would in standard search. This is a signal of higher intent, not lower.
For advertisers, higher-intent queries mean higher conversion potential. The challenge is that traditional ad copy — short, keyword-matched, designed for a results list — does not translate directly into a conversational AI context.
What changes for advertisers
Google has confirmed that existing Search and Performance Max campaigns are eligible for AI Mode placements, consistent with its approach to AI Overviews. No separate setup is required to be eligible.
What does change is what good performance looks like. In AI Mode, the quality and relevance of your ad assets — headlines, descriptions, landing page content — are evaluated in the context of a multi-turn conversation. Generic copy performs worse. Copy that is specific, informative, and directly relevant to the intent behind the query performs better.
The advertisers who are already optimising for AI Overviews will have a head start. The underlying principles are the same: write for intent, not keywords. The scale of the opportunity in AI Mode is larger.
Sources: Google Blog — AI Mode in Search · Search Engine Land — Google I/O 2025: AI Mode · The Verge — Google I/O 2025