Google Gemini is Google's family of AI models and the app that runs them, the technology behind the AI features on Android phones, Pixel devices, Google Nest speakers and in Gmail and Docs. If you have used an Android phone in the last two years, you have already used Gemini, often without seeing its name. The confusing part is that "Gemini" means several different things at once, and untangling them is the key to understanding what it actually does.
Gemini the Model vs Gemini the App:
This is where the confusion starts, so it is worth being clear.
Gemini the model is Google's underlying AI, trained on huge amounts of text, code and images. It does the thinking. Gemini the app is a separate application on Android and iOS that gives you direct access to that model through a chat interface, like the ChatGPT app.
Beyond the app, Gemini the technology is built into Gmail, Docs, Messages, Android's assistant and Nest devices, usually without being labeled "Gemini" at all.
What Are the Different Gemini Versions?
Google offers Gemini at different sizes. Bigger models are more capable but need more power, which is why different versions run in different places. The current generation is the Gemini 3 series, launched in November 2025.
Version | Where it runs | Used for |
|---|---|---|
Gemini 3.1 Flash-Lite | On-device (phone) | Instant, offline tasks like smart reply |
Gemini 3.5 Flash | Cloud (fast) | Most app queries, the current app standard |
Gemini 3.1 Pro | Cloud | Complex reasoning, long documents (2M token context) |
Gemini 3 Deep Think | Cloud (Ultra plan) | The hardest reasoning and research tasks |
For most people the app runs on Gemini 3.5 Flash, on-device tasks use a small Flash-Lite model, and the hardest work uses 3.1 Pro or Deep Think. Note that "Ultra" is no longer a model name, it is now the top subscription tier.
What Does Gemini Do on Android Phones?
On Android, Gemini has now replaced Google Assistant as the default assistant on new phones, with the Assistant being retired.
Contextual help lets you ask about whatever is on your screen and get answers or actions across apps. Circle to Search lets you draw a circle around anything on screen and search it without leaving the app. Messages and Gmail use Gemini to summarize threads, suggest replies and draft emails with Help Me Write.
And Pixel phones get the deepest integration: Call Assist screens and summarizes calls, and Pixel Screenshots makes every screenshot you have taken searchable.
How Does Gemini Work on Nest and Smart Home Devices?
Google is upgrading Nest Hub displays from Assistant to Gemini. For basic commands like timers and lights, the two feel the same. The difference shows in conversation: ask what you can cook with the ingredients you have, and Gemini gives a full recipe and adjusts it as you follow up. The upgrade matters most for tasks that go beyond simple commands.
How Much Does Gemini Cost?
The base app is free and runs on Gemini 3.5 Flash, enough for most people. Paid plans are now Google AI Pro and Google AI Ultra, not the old "Gemini Advanced" name.
Ultra unlocks Deep Think mode, the largest context windows and deeper Workspace features. They are worth it mainly if you work with long documents, do heavy analysis or coding, or use AI constantly inside Docs and Sheets.
How Does Gemini Compare to Apple and Samsung?
Gemini's biggest edge is native Google integration. It has direct access to Google Search, so it pulls current information rather than relying only on training data, and it plugs into Gmail, Drive and Calendar to act on your real data. It is also strongly multimodal, handling long PDFs and image analysis reliably, with translation among the best on any device.
Where it falls behind is privacy and Apple integration. Gemini is cloud-first, so most features send data to Google's servers, while Apple Intelligence keeps more work on-device. And although the app runs on iPhone, it stays a standalone chat tool there rather than powering features across iOS.
Conclusion:
Gemini is best understood as three things at once: the model that thinks, the app you chat with, and the technology quietly running AI features across Google's products. In 2026 it runs on the Gemini 3 series, it is free for most uses with Pro and Ultra plans above that, and it is now the default assistant on Android. If your digital life runs on Google services.
Gemini is the assistant that fits it most naturally. If you live inside Apple's ecosystem, Apple Intelligence will still integrate more tightly with your device.
(FAQs):
Q1: Is Gemini replacing Google Assistant?
A: Yes. Gemini is now the default assistant on new Android phones and Google is retiring the Assistant. Some smart home and device controls still route through Assistant, and the transition is finishing across older devices.
Q2: Is Gemini free to use?
A: Yes. The app is free on Android and iOS and runs on Gemini 3.5 Flash. Paid plans, Google AI Pro and Google AI Ultra, add Deep Think mode, larger context windows and deeper Workspace features.
Q3: Which phones have on-device Gemini?
A: On-device Gemini runs on Google Pixel 8 and later, Samsung Galaxy S24 and later, and other phones using a recent Snapdragon 8 Elite or equivalent chip. It powers offline features like smart reply and call screening.
Q4: Does Gemini work on iPhone?
A: The Gemini app is on iPhone, but it does not integrate into iOS the way Apple Intelligence does. You can chat, generate images and work with documents, but it will not power features across your iPhone's apps and settings.
Google Gemini changes frequently with updates. This reflects the state of Gemini as of August 2026.