Until August 31, 2026, the deal with AI Overviews was positional: the answer takes the top of the page, the links keep the rest. That day, SEO consultant Chris Long documented an AI Overview taking all of it, expanding to consume the full search results page rather than appearing only at the top of results. 9to5Google's Ben Schoon reported it the same day. Google confirmed the behavior the same week in an on-record statement to Search Engine Roundtable, describing it as a systems-driven, per-query decision rather than a blanket rollout: AI Overviews "may dynamically expand for topics where our systems determine it's most useful for people," a change Google justified by research showing users "engage deeper in follow-up exploration." The confirmed trigger category is definitional searches, the "what is X" phrasing. That is the whole of the disclosed scope. Google gave no percentage of affected queries, no opt-out, and no rollout-completion date, so the practical exposure is open-ended this week.
Sources:
9to5Google: Ben Schoon, "Google is making AI Overviews even bigger on some search queries," August 31, 2026, https://9to5google.com/2026/08/31/google-search-ai-overviews-bigger/
Search Engine Roundtable: Google's on-record statement on dynamic AI Overview expansion, as quoted within the 9to5Google article above (the original SER article was not independently re-fetched in this run; flagging per traceability rule).
Credibility: HIGH. The triggering fact is an on-record Google statement responding to a named reporter's query, corroborated by a reproducible UI sighting from a named SEO consultant (Chris Long) and reported by an established SEO trade outlet (9to5Google). Known bias: SEO trade press has an incentive to frame any AI Overview change as maximally disruptive; the statement itself carries no numeric scope, which this brief preserves rather than estimates.
Fact bullets:
- First public sighting: August 31, 2026, posted by Chris Long, reported by 9to5Google.
- Google's on-record statement (to Search Engine Roundtable): AI Overviews "may dynamically expand for topics where our systems determine it's most useful for people," justified by research showing users "engage deeper in follow-up exploration."
- Confirmed trigger category: definition/glossary-style queries.
- Not disclosed by Google: percentage of queries affected, opt-out mechanism, or rollout-completion date.
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For teams tracking non-brand search demand, the sentence to sit with is Google's own: users "engage deeper in follow-up exploration." Follow-up exploration is a real behavior. It now has somewhere to happen that is not your site. This is the second confirmed expansion of AI Overview footprint in 2026, and what it takes is not spare inventory. If Google's systems judge a query definitional, the AI Overview can occupy the space organic results 1 to 3 used to hold. You can hold position one and still lose the visit, and the awkward part is that position one is what your reporting will keep showing you. Your rank tracker keeps doing exactly the job it was built for; that job now covers less of the page than it did last month. The gap between impressions and clicks is where this surfaces first. Google disclosed no scope and no opt-out, so the honest posture is measurement rather than a fix: baseline it now, argue about it in October.
Recommended actions:
- Pull the GSC Search Results report for target queries containing "what is," "how does," and "definition of" phrasing, and compare clicks against impressions week-over-week from August 31, 2026 onward. A widening gap is the signal here; the ranking itself will look untouched.
- Ask your web team whether those pages open with a single self-contained answer passage that quotes cleanly out of context. If they open with a preamble instead, have the opening paragraph rewritten to answer the query in one block, since expanded AI Overviews pull more heavily from pages structured that way.
- Record which target queries return a full-page AI Overview this week and keep the list. Google gave no opt-out and no rollout schedule, so this is a moving baseline, not a one-time check.
9to5Google: Ben Schoon, "Google is making AI Overviews even bigger on some search queries," August 31, 2026, https://9to5google.com/2026/08/31/google-search-ai-overviews-bigger/
Search Engine Roundtable: Google's on-record statement on dynamic AI Overview expansion, as quoted within the 9to5Google article above (original SER article not independently re-fetched this run).