Best AI Tool for Business: ChatGPT vs Claude vs Gemini vs Copilot Compared

If you're reading this, chances are you're wanting to use AI more for your business. You see the ads and the LinkedIn posts about how it will "revolutionise your life," but the reality is… between the dozens of options and settings, the thing that's meant to simplify your life is instead leaving you feeling more confused than ever.

Luckily, that's what we're here for. We're going to break down the four main options for AI (plus one extra option you may not have heard of), what they're best for, what they're bad for, and the two massive problems with using them that no one seems to be talking about.

ChatGPT: The Generalist

Probably the first one which comes to mind when you think about AI, and for good reason. ChatGPT is the mate who's read every book, remembers none of the sources, and will absolutely help you draft a strongly-worded email at 11pm without judging you for it. Brilliant for brainstorming, drafting, summarising, and asking "is this normal?" questions you'd never type into a work Slack.

• Capability: Broad and flexible — the reliable all-rounder for writing, ideas, and general faffing about.

• Cost: Free tier available; Plus/Team from roughly £16–£23/user/month if you want it to behave a bit better.

• Data & GDPR: Free tier inputs may get used for training unless you opt out. Paid Team/Enterprise tiers offer no-training guarantees and better data handling.

Gemini: The One That Lives in Your Google Stuff

Gemini's whole personality is "I already know what's in your Gmail and your Docs, so let's not pretend otherwise." If your business runs on Google Workspace, it slots in like it's always been there — drafting from context, summarising threads, living in the tools you already have forty tabs of open. Outside the Google ecosystem, it's a fish with strong opinions about water it's not currently in.

• Capability: Excellent with your Google data behind it; a bit lost without it. Also worth knowing — it's already sitting on most Android phones, whether you've opened it or not.

• Cost: Bundled into Workspace's paid tiers (roughly £5–£20/user/month), or free with a personal account.

• Data & GDPR: Business tiers keep your data out of training and offer EU residency options. The free version is built for your personal Gmail, not your client list — don't get those confused.

Copilot: The One That's Already Paying Rent in Your Office

If you're on Microsoft 365 — and most of you reading this are — Copilot isn't a new tool you need to go and buy. It's a feature you're already entitled to and almost certainly under-using. Reads your emails, drafts in your tone, turns a bullet list into a slide deck, all inside the walls Microsoft already locked up for you.

• Capability: Excellent for email, documents, meetings; less exciting if you want it to get creative.

• Cost: Basic Copilot comes bundled with most Microsoft 365 licences already — you may well be paying for it and not know it. The full "does everything" version is roughly £24/user/month on top.

• Data & GDPR: Inherits your existing tenant's compliance, permissions, and residency settings. Nothing new leaves the building. If your M365 governance is sorted, this is the lowest-drama option on the list.

Claude: The One That Actually Reads the Whole Document

Claude's party trick is not losing the plot halfway through a long, dense, or genuinely tedious document — contracts, policies, that spreadsheet of client feedback nobody wants to open. If ChatGPT is the mate who's read every book, Claude's the one who actually finished the last chapter before giving you an opinion on it.

• Capability: Best-in-class for long, technical, or careful work; not the one you want for quick banter.

• Cost: Free tier available; Pro from roughly £16/month, Team/Enterprise pricing for businesses.

• Data & GDPR: Business tiers don't train on your data by default and offer solid enterprise controls — but it's a US provider, same as ChatGPT, so EU data transfers are worth checking, not assuming.

Self-Hosted AI: The One for People With Opinions and an IT Budget

Running your own model, on your own hardware, under your own control. Nothing leaves the building, no third party ever sees your inputs, and it's the kind of setup that makes a compliance officer well up with pride.

• Capability: Entirely down to what you build and maintain — could be brilliant, could be "why did we bother," and there's no vendor to blame either way.

• Cost: No subscription, but real hardware, hosting, and someone competent enough to run it — which usually costs more than the marketing pretends.

• Data & GDPR: The gold standard on paper — full control, nothing leaving the premises. But that only holds if it's actually configured, patched, and watched properly.

Which AI Tool Should You Choose? Quick Picks by Use Case

• Mostly emailing and drafting on Microsoft 365? Copilot, then ChatGPT.

• Writer or need something to sound genuinely human? Claude, then ChatGPT.

• Google Workspace shop? Gemini, then ChatGPT.

• Privacy is non-negotiable? Self-hosted first, then whichever enterprise tier of the others has the strongest data terms.

• Genuinely not sure? Start with whatever's already bundled into what you're paying for (usually Copilot or Gemini) before buying something new.

And Don't Forget What It Plugs Into

Capability's only half the story — the other half is whether it actually fits into the tools you already use, or whether you're copying and pasting between six tabs like it's 2015.

• Copilot wins here by default if you're on M365 — already inside Word, Excel, Outlook, and Teams.

• Gemini does the same for Google Workspace — Gmail, Docs, Sheets, Drive, connected out of the box.

• ChatGPT has the widest third-party ecosystem if you're not tied to Microsoft or Google.

• Claude is lighter on native integrations, but strong where it does connect — and improving fast.

• Self-hosted integrates with exactly what you build it to integrate with. Total flexibility, total effort.

The short version: the "best" AI on paper is worthless if it's sitting outside your actual workflow, making you do more admin, not less.

The Two Problems With AI Tools No One's Talking About

Every company on this list has, at some point, had a public row about how they train their models or what they do with user data. That's a real conversation, and not one we're getting into here — but it's worth knowing it exists before you assume any of these are neutral, harmless tools. That said, two specific problems matter more than picking the "right" one:

1. It leaks. Paste something sensitive into the wrong tool, wrong tier, wrong settings, and it can end up somewhere it was never meant to be — used for training, stored somewhere you didn't agree to, or just sat on a server outside the UK. This isn't rare. It's the default unless someone's actively checked.

2. It lies, confidently. Every one of these tools will occasionally invent a fact, a figure, or a policy — and say it with the same certainty as when it's right. It won't flag it. It won't hesitate. It'll just sound correct.

Neither of these is a reason to avoid AI. They're the reason "just pick one and crack on" is bad advice. Use the right tool for the job, double-check what it tells you, and make sure someone's keeping an eye on where the data's actually going.

Frequently Asked Questions

What's the best AI tool for a small UK business? Depends what you're already paying for. On Microsoft 365, Copilot. On Google Workspace, Gemini. Need better writing or document handling, Claude. Want the widest general-purpose tool, ChatGPT.

Is ChatGPT GDPR compliant for business use? The free tier isn't built for client data — inputs may be used for training. Paid Team and Enterprise tiers offer no-training guarantees and better data handling.

Which AI tool is safest for sensitive client data? Self-hosted models keep everything on your own infrastructure. Among the commercial tools, enterprise tiers with no-training guarantees and EU data residency are the next best thing.

Not sure what your team's already using — or whether it's safe to keep using it? Book a quick AI & data security review with First Contact and we'll tell you straight.