ChatGPT, Gemini, Copilot, Grok: What's the Difference?

If you've been anywhere near the internet in the last couple of years, you'll have heard of ChatGPT. You might have also heard of Gemini, Copilot, and Grok. Maybe someone mentioned them in passing and you nodded along. Maybe you've tried one but aren't sure what makes it different from the others.

You're not alone. Most people I speak to know AI is a thing but couldn't tell you why there are so many of them or which one they should actually be using. So here's the plain English version. No jargon, no hype. Just what each one is, who makes it, and why you might care.

chatgpt

Made by: OpenAI

This is the one that started it all, or at least the one that made everyone pay attention. ChatGPT launched at the end of 2022 and within two months had over 100 million users. It's a chatbot you type questions into, and it gives you answers in plain English. You can ask it to write emails, summarise documents, brainstorm ideas, explain things, help with homework, draft social media posts, or just have a conversation.

The free version is perfectly capable for most everyday tasks. The paid version (ChatGPT Plus, about £20 a month) gives you access to more powerful models, image generation, and the ability to upload files and work with them.

Where you'll find it: The ChatGPT website or app. It's not built into anything else by default, so you have to go looking for it.

Best for: Writing, brainstorming, research, answering questions. If you've never tried AI before, this is probably the place to start.

gemini

Made by: Google

Gemini is Google's answer to ChatGPT. It used to be called Bard, then Google renamed it (they do this a lot). The big difference is that Gemini is woven into the Google products you probably already use. It's in Gmail, Google Docs, Google Search, Google Maps, and Android phones.

If you've noticed Google Search giving you an AI-generated summary at the top of your results instead of just links, that's Gemini. If you use an Android phone, Gemini is becoming the default assistant, replacing Google Assistant for a lot of tasks.

Where you'll find it: Google Search, Gmail, Google Docs, Android phones, and the standalone Gemini app. If you use Google products, you're probably already bumping into it.

Best for: People who live in the Google ecosystem. It's particularly good when you need AI that can pull in information from your emails, calendar, and documents all at once.

copilot

Made by: Microsoft

Copilot is Microsoft's AI, and it's the one most likely to sneak into your life without you realising. It's built into Windows 11, Microsoft Edge, Bing, and if you have a Microsoft 365 subscription it's increasingly appearing inside Word, Excel, Outlook, and Teams.

That little Copilot icon in the corner of your Windows taskbar? That's it. The AI features appearing in Bing search results? Also Copilot. Microsoft has essentially taken the same technology that powers ChatGPT (they invested billions in OpenAI) and embedded it across everything they make.

Where you'll find it: Windows, Edge, Bing, Microsoft 365 apps. If you use a Windows PC, it's already there.

Best for: Anyone who works in Microsoft Office. Being able to ask Copilot to summarise a long email thread in Outlook, or generate a first draft in Word based on a bullet list, is genuinely useful for day-to-day office work.

grok

Made by: xAI (Elon Musk's company)

Grok is the newest of the bunch and it lives inside X (formerly Twitter). Its main selling point is that it has real-time access to everything posted on X, so it can answer questions about what's happening right now. It's also deliberately less filtered than the others, so it tends to be more blunt and occasionally irreverent in its answers.

If you use X, you've probably seen Grok suggested when you tap the search bar or when you're reading posts. It was initially only available to paying X Premium subscribers, but basic access has been opened up more broadly.

Where you'll find it: X (Twitter). That's basically it for now.

Best for: Getting quick takes on trending topics and current events. It's less useful for business tasks than the others, but if you want an AI that knows what's happening on social media right now, this is the one.

a few others worth knowing about

Those four are the ones you're most likely to encounter in everyday life, but they're not the only ones. Meta AI (from Facebook) is appearing inside WhatsApp, Instagram, and Messenger. If you use any of those apps, you've probably already seen it. Perplexity is an AI search engine that gives you sourced answers with links, a bit like a research assistant. And there are others quietly powering things behind the scenes that most people never interact with directly.

The point isn't to know all of them. It's to understand that AI isn't one thing. It's a technology that different companies are building into different products in different ways.

so what's actually the difference?

Honestly? For most everyday tasks, the answers you get from any of them will be pretty similar. Ask all four to write a thank-you email to a customer and you'll get four perfectly usable emails. The real differences come down to three things:

• Where they live. ChatGPT is a standalone app. Gemini is woven into Google. Copilot is woven into Microsoft. Grok lives on X. You'll naturally gravitate towards whichever one is already part of your workflow.
• What they can access. Gemini can see your Google Drive. Copilot can work with your Office documents. Grok can see live X posts. ChatGPT can search the web and work with uploaded files. The AI that has access to your stuff is the one that'll be most useful to you.
• Personality. They each have a slightly different tone. ChatGPT is polished and thorough. Gemini is concise and factual. Copilot is helpful and safe. Grok is blunt and a bit cheeky. You'll have a preference, and that's fine.

where this is all heading

Right now, most people use AI as a question-and-answer tool. You type something in, you get something back. That's useful, but it's only the beginning.

The next step is what the industry calls agentic AI, and it's worth understanding because it's coming fast. Instead of just answering your questions, AI will start doing tasks for you. Think of the difference like this:

That's not science fiction. All four of these companies are actively building this. Google's Gemini is already starting to take actions inside Gmail and Calendar. Microsoft's Copilot can automate multi-step tasks in Office. The AI doesn't just talk to you, it does things on your behalf.

For small businesses, this matters. Right now AI can help you write a better email. Soon it'll handle the follow-up, update your records, and chase the invoice. The businesses that understand what's possible will have a genuine advantage over those that don't.

which one should i use?

The honest answer: whichever one is already closest to hand.

• If you use Google for everything (Gmail, Google Drive, Android phone), start with Gemini
• If you're a Windows and Microsoft Office user, start with Copilot
• If you just want to try AI and see what the fuss is about, start with ChatGPT
• If you live on X and want real-time social media insight, try Grok

You don't need to pick one and stick with it forever. Try a couple. See which one feels natural. The important thing is that you start using it at all, because AI isn't going away and the gap between businesses that use it and businesses that don't is only getting wider.

a word about ai "solutions" being sold to small businesses

You might have noticed that IT companies and managed service providers are suddenly offering "AI packages" to small businesses. Be careful with these. In most cases, what's actually happening is a third-party vendor has built a generic product, and your IT company is reselling it with a markup and a 12-month contract. They didn't build it. They don't fully understand it. And when something doesn't work the way you need it to, they'll be raising a ticket with someone else just like you'd raise a ticket with them.

That's box-shifting, not AI expertise.

Everything I build for my clients is designed from scratch, for them. When I set up an AI chatbot on your website, it's trained on your business, your services, your tone of voice. When I build an AI assistant to handle your phone calls, it knows your opening hours, your pricing, your FAQs. It's not a white-label product with your logo stuck on the front. It's yours, built around how your business actually works.

There's no middleman, no third-party platform taking a cut, and no contract locking you into something that doesn't fit. If it needs changing, I change it. If it needs improving, I improve it. That's the difference between someone who builds AI and someone who sells it.