Article contents

1. What’s New in Gemini 2.5?

• Gemini 2.0 vs 2.5: What’s Changed

2. Gemini 2.5 Flash

• Key Features
• Best Use Cases
• Things to Know

3. Gemini 2.5 Pro

• Key Features
• Best Use Cases
• Things to Know

4. Gemini 2.5 Flash vs Pro: What’s the Difference

5. Gemini 2.5 vs ChatGPT: Google vs OpenAI

6. How to Access Gemini 2.5 

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Google has introduced Gemini 2.5, its most advanced AI update yet — with two models built for very different jobs.

Gemini 2.5 Flash is designed for speed and efficiency, perfect for real-time tasks and lightweight applications.

Gemini 2.5 Pro handles complex tasks with deeper reasoning, longer context, and more power under the hood.

Both models run on the new Gemini architecture, but they’re tuned for very different use cases. In this article, we’ll break down their key features, differences, and where each one shines.

Try Gemini 2.5 in the Sigma Chat — Test the latest Google AI model in a fast, natural chat experience. 

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What’s New in Gemini 2.5

Gemini 2.5 brings major upgrades to Google’s AI lineup — pushing the models further in reasoning, memory, and input flexibility.

The most important changes include:

• Smarter reasoning across complex tasks and code
• Support for up to 1 million tokens in long-form prompts and documents
• Improved multimodal input — text, images, audio, and video
• More efficient performance, optimized for different use cases
  
  

This generation also marks the first time Gemini is split into two versions:
Flash, focused on speed and real-time response — and Pro, designed for depth and heavy workloads.

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Gemini 2.0 vs 2.5: What’s Changed

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Google made a clear shift in Gemini 2.5: from a general-purpose AI to task-optimized models with distinct strengths.

Read more about the previous generation Gemini 2.0

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Gemini 2.5 Flash

Gemini 2.5 Flash is the lightweight, high-speed version of Google’s latest AI model — designed for real-time use in apps, mobile, and the web.

It's faster to respond, uses fewer resources, and supports up to 1 million context tokens. Flash is ideal for fast writing, summarising, and quick Q&As — especially in mobile and browser-based AI experiences.

Unlike Gemini Pro, Flash prioritizes speed and efficiency over complex reasoning, making it a perfect fit for everyday interactions. 

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Key Features of Gemini Flash

Blazing Fast

The fastest model in the Gemini family, instant replies and real-time streaming in chats, apps and assistants.

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Efficient by Design

Powered by Mixture-of-Experts architecture, Flash runs only what it needs — reducing latency and saving compute, perfect for mobile and web.

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Long Context

Supports up to 1 million tokens, so it can handle long threads, documents, and coding sessions with stability and speed.

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Built-in Tools

Flash works with Gemini API tools like calculators, file readers, code helpers, and search — right out of the box.

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Google-Ready

Already integrated into Gmail, Docs, Chrome, Android, and Gemini Nano — designed to power Google’s real-time AI features.

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Best Use Cases

• Responding instantly in live chats and AI assistants
• Summarizing emails, documents, and web content
• Handling lightweight code or text generation on the fly
• Powering fast, embedded AI across mobile and browsers
• Scaling to thousands of users without slowing down

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Things to Know

• Not designed for deep reasoning or advanced logic
• Limited tool use compared to Gemini Pro
• Better suited for speed-focused tasks than long analysis

Sigma AI Browser allows you to solve a wide range of tasks in your daily workflow - thanks to its built-in tools, simple user interface and no need for customisation.

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Gemini 2.5 Pro

The fastest model in the Gemini family, instant answers and streamingGemini 2.5 Pro is Google's most advanced artificial intelligence model. With precision, structure and memory, it performs complex tasks: deep learning, large-scale tasks and deployed context analysis.

It supports multimodal input (text, images, audio and video) and handles up to 1 million tokens to solve ultra-complex problems.

Compared to Flash, Pro focuses less on speed and more on logic, depth, and accuracy — a better fit for high-stakes AI applications and professional environments.

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Key Features of Gemini Pro

Deep Reasoning

Gemini Pro can break down complex questions step by step, follow long chains of logic, and give thoughtful, structured answers.

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Multimodal Understanding

Communicate by text, display images, play audio, and even upload videos — he'll understand all of this at the same time, as a truly flexible assistant.

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Long Context

Working on a long document? A giant thread? Or a multi-file codebase? Gemini Pro keeps track of everything — up to 1 million tokens — without losing the plot.

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Pro-Level Coding

Whether you’re writing functions, fixing bugs, or juggling multiple files — Pro writes clean code, explains it clearly, and helps you get unstuck faster.

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API & Tool Integration

Gemini Pro is ready for real work — available through Gemini API, Google AI Studio, and Vertex AI. Whether you're building apps or running internal tools, it's ready to plug in.

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Best Use Cases

• Solving multi-step technical or logical problems
• Analyzing large documents or datasets in context
• Generating, debugging, and refactoring code
• Assisting with scientific writing, research, and analysis
• Powering AI apps that require structure and long-term memory

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Things to Know

• Slower than Flash in basic tasks or real-time response
• Requires more compute resources
• Best used when depth and accuracy matter more than speed

Delve into the research on Gemini 2.5 Pro and see how it’s pushing AI further in coding and reasoning.

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Gemini 2.5 Flash vs Pro: What’s the Difference?

Although both models share the same basic architecture, they are optimised for different tasks. Here is a brief comparison:

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In short:
Choose Flash when speed matters most.
Choose Pro when depth, reasoning, or code quality are critical.

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Gemini 2.5 vs ChatGPT: Google vs OpenAI

Both Google and OpenAI are leading the AI race — but their models differ in performance, style, and real-world focus. Here's how Gemini 2.5 (Flash & Pro) stack up against ChatGPT (GPT‑4):

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See a hands-on comparison on Tom’s Guide — tested across writing, image generation, and reasoning tasks.

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How to Access Gemini 2.5 

Both Gemini 2.5 models — Flash and Pro — are available to use today across Google’s ecosystem.

Gemini API

Access both Flash and Pro directly through the Gemini API. Ideal for developers who want to integrate AI into apps, services, or automation workflows.

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Google AI Studio

A no-code / low-code platform for testing Gemini prompts, tools, and prototypes. Great for experimenting before launching full builds.

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Sigma Chat 

You can try Gemini 2.5 Flash directly in Sigma Chat — for free.
No setup, no API keys — just open the chat and start working with real-time AI in seconds.

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Vertex AI (Pro only)

For enterprise use, Gemini 2.5 Pro is available in Vertex AI, Google Cloud’s production-ready AI stack — with scalability, fine-tuning, and advanced integration options.

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Built Into Google Products (Flash)

Flash powers real-time AI across Gmail, Docs, Chrome, Android, and Pixel devices (via Gemini Nano). No setup required — it’s already built in.

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The release of Gemini 2.5 is a new approach to building, deploying and scaling AI. By splitting the model into Flash and Pro, Google moves beyond the “one-model-fits-all” approach. It’s now targeting real-world use cases more precisely: fast, embedded AI in everyday tools, and deep, reasoning-driven AI for serious technical tasks.

This modular strategy — blending performance with specialization — may set the tone for the next wave of AI development across the industry.

With Sigma AI Browser, you can use AI the same way: run real-time models directly in your browser, solve daily or technical tasks with no setup, and keep everything private and secure.