Gemini vs AI Mode is a confusing comparison because Google uses the word Gemini for both a model and an app, and AI Mode runs on that model. The short version: AI Mode is Google Search answering with AI, and the Gemini app is an assistant. They draw on the web differently, cite differently, and a website controls them with different switches. This post sets them side by side.
Three names, two products
AI Overviews are “an AI-generated snapshot with key information and links to dig deeper”, shown at the top of results when Google decides generative AI will help. They are “a core Google Search feature” and cannot be turned off[1]. AI Mode is “Google’s most powerful AI search experience”: it splits a question into subtopics and searches each at once, a technique Google calls query fan-out, and falls back to plain web links when it is not confident[2].
Google has been joining the two. In January 2026 it let people ask a follow-up from an AI Overview and continue in AI Mode[8]; at I/O in May 2026 it described them as “one, seamless AI Search experience”, live on desktop and mobile worldwide[5]. The Gemini app is the other product: a standalone assistant. When it uses sources, it shows a Sources button, but “not all responses include related links or sources”[3].
| AI Mode (with AI Overviews) | Gemini app | |
|---|---|---|
| What it is | Google Search, answering with AI | A standalone AI assistant |
| How it finds sources | Query fan-out across the web | Grounding in the Google Search index |
| Shows sources | Links alongside the answer; plain web links if unsure | Sometimes, via a Sources button |
| Monthly users | 1B+ (AI Overviews 2.5B+), May 2026 | 1B+, August 2026 |
| Default model | Gemini 3.5 Flash since May 2026 | Gemini models |
| Site control | Search Console toggle, nosnippet, noindex | Google-Extended in robots.txt |
They cite different sources
Because they are separate products, the same brand can do well in one and poorly in another. Profound tracked 15,155 brand-category pairs daily through May 2026 and found a median 8-point visibility gap between Gemini, AI Overviews and AI Mode for the same brand, and more than 10 points for over a third of brands. The gap between surfaces was 2.2 times the normal day-to-day movement of any one of them[12]. They also cite different amounts:
| AI Mode | 15.2 |
|---|---|
| AI Overviews | 11.1 |
| Gemini | 6.6 |
Even AI Mode and AI Overviews disagreed before they merged: SE Ranking found they shared only 10.7% of cited URLs and 16% of domains across 10,000 keywords[13]. The practical lesson is to track each surface separately. A good AI Overviews number says little about the Gemini app.
Which switch controls which
This is where the difference matters most to a website. For AI Overviews and AI Mode, a page only needs to be “indexed and eligible to be shown in Google Search with a snippet”, and the usual controls apply: noindex, nosnippet, max-snippet[9]. Since June 2026 Search Console also has a toggle that removes a site from AI Overviews, AI Mode and AI Overviews in Discover, without being used as a ranking signal elsewhere[10]. Google-Extended, a robots.txt token, controls something else: whether your content trains Gemini models and grounds answers in the Gemini app and Vertex AI. Google says it “does not impact a site’s inclusion in Google Search”[11].
- Google Search resultsIncluded
- AI Overviews and AI ModeIncluded
- Gemini app answers (grounding)Excluded
- Gemini model trainingExcluded
What to do about it
Optimise once, measure separately. The work that earns citations is the same: be indexed, be eligible for a snippet, answer the question plainly, and be mentioned in the sources both draw on. The AI Mode guide and the Gemini SEO guide cover each in depth, and AI Overview tracking covers what Search Console can and cannot show. Then track each surface on its own, because they will not move together.
Questions people ask
What is the difference between Gemini and AI Mode?
AI Mode is part of Google Search: it answers inside search results, searches the web for each question and shows links. Gemini is a separate assistant app for chat, writing and tasks, which can ground its answers in the Google Search index but does not always show sources. Both run on Google's Gemini models.
Is AI Mode the same as AI Overviews?
They are now one experience. AI Overviews are the AI summaries at the top of results; AI Mode is the conversational follow-up. Since May 2026 Google describes them as one, seamless AI Search experience, so a follow-up from an AI Overview continues in AI Mode.
Which model does AI Mode use?
Google's Gemini models. Gemini 3 Flash became AI Mode's default in December 2025, and at I/O in May 2026 Google made Gemini 3.5 Flash the new default for its AI Search experience globally.
Does blocking Google-Extended remove my site from AI Mode?
No. Google-Extended controls Gemini model training and grounding in the Gemini app and Vertex AI, and Google says it does not affect inclusion in Google Search. To leave AI Overviews and AI Mode, use the Search Console control or nosnippet.
How many people use Gemini and AI Mode?
Google said in May 2026 that AI Overviews had over 2.5 billion monthly users and AI Mode over 1 billion. The Gemini app passed 1 billion monthly users in August 2026.