What Is Google Gemini? A Complete Introduction for 2026: Version Comparison, Features, and Differences from ChatGPT

Google Gemini is a large language model (LLM) series developed by Google DeepMind. It was officially released at the end of 2023 and has since become the core engine behind all of Google’s AI products. This article provides a complete introduction to what Gemini is, the differences between its versions, its main features, and a comparison with ChatGPT.

Last updated: March 2026

What is Gemini?

Google Gemini is Google’s flagship AI model, with multimodal understanding capabilities for text, images, video, audio, and code. It also serves as the AI foundation for products such as Google Search, Gmail, Google Docs, and the Android Assistant, and it offers an API so developers can use it.

Gemini version comparison (latest for 2026)

Version Positioning Best for Gemini 2.5 Pro strongest reasoning, supports the Deep Think deep thinking mode Complex analysis, software development, creative writing Gemini 2.5 Flash fast and low cost Daily Q&A, quick tasks Gemini 2.5 Flash TTS low-latency speech synthesis Voice applications, real-time conversations Gemini Nano runs on-device (phone) Android local AI features

Main features of Gemini

Multimodal understanding

Gemini can process text, images, video, audio, and code at the same time. You can upload an image for it to analyze, paste a piece of code for debugging, or upload a PDF for summarization.

Ultra-long context window

Gemini 2.5 Pro supports up to a 1 million token context window, allowing it to ingest an entire codebase, long reports, or even an entire book in one go for deep analysis.

Deep Think deep thinking mode

The Deep Think mode, which is unique to Gemini 2.5 Pro, is similar to OpenAI’s o-series reasoning models. It enables the AI to perform multi-step deep thinking before answering, making it especially suitable for complex tasks that require strategy planning and creative ideation.

Integration across the Google ecosystem

Gemini is deeply integrated with Google Workspace: in Gmail it can automatically summarize emails and draft replies; in Google Docs it can generate content; in Google Meet it can capture real-time transcripts; and in Google Maps it can understand natural-language queries. Apple is also using Gemini’s outputs to train the Siri model, showing that its influence has gone beyond the Google ecosystem.

Gemini vs ChatGPT: main differences

Comparison item Gemini ChatGPT Developer Google DeepMind OpenAI Strongest model Gemini 2.5 Pro GPT-4o / o3 Real-time search Native integration Google Search Requires enabling search feature Context length 1 million tokens 128 thousand tokens (GPT-4o) Ecosystem integration Google Workspace, Android Microsoft 365, Bing Free plan Gemini.google.com ChatGPT free version

How to use Gemini?

Go to gemini.google.com and log in with your Google account to use it for free

Advanced features (Gemini 2.5 Pro, Deep Think, more upload capacity) require subscribing to the Google One AI Premium plan

Developers can try the API for free through Google AI Studio

Frequently Asked Questions FAQ

Is Gemini free?

The basic version is free; you can use it via gemini.google.com. Advanced Gemini 2.5 Pro and Deep Think require a subscription to Google One AI Premium (about $20 per month).

Can Gemini be used in Chinese?

Yes. Gemini supports Traditional Chinese and Simplified Chinese, and users in Taiwan can chat directly in Chinese.

What is the relationship between Gemini and Google Bard?

Google Bard was Gemini’s predecessor and was officially renamed to Gemini in 2024.

This article will continue to be updated with the latest Gemini features and version information.

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