Your team already uses AI: some on ChatGPT, some on Gemini on their phones, one or two on Claude, and most of them on personal accounts. Now you have to pick a business tool and pay for seats, and every comparison says something different. This guide compares ChatGPT, Claude, Gemini and Microsoft Copilot from a small or mid-sized business’s point of view: what each one costs, what it’s best at, how it fits your tools and what happens to your data.
The short answer
- All four are good. For everyday office work (writing, summarising, analysing, research), the gap between them is smaller than the gap between a trained team and an untrained one.
- What usually decides it is where you already work. If your company runs on Google Workspace, Gemini is already in your plan. If it runs on Microsoft 365, Copilot sits inside Word, Excel, Outlook and Teams. ChatGPT and Claude connect to both.
- Claude stands out for long, polished writing, long documents, coding (Claude Code) and handing off whole tasks on your files. ChatGPT is the most complete all-rounder: images, voice, research, agents and a huge ecosystem.
- Price: ChatGPT and Claude business plans cost around $20–25 per user per month. Gemini comes with Google Workspace from Business Standard (with Gemini in Docs and Sheets). Copilot Business is a $21 per user per month add-on on top of your Microsoft 365 licence.
- EU data: only Copilot keeps data in the EU by default for European customers (through Microsoft’s EU Data Boundary, with exceptions such as Anthropic models). ChatGPT, Claude and Gemini don’t on their entry business plans. If that’s a requirement, check which plan and settings guarantee it before you sign.
What each one is: models and plans in October 2026
Model names change every few months, so don’t choose by this quarter’s model. Choose by product, ecosystem and data terms, which change much more slowly.
- ChatGPT (OpenAI). The GPT-6 family (Luna, Sol and Astra, plus GPT-6.1 Sol) on ChatGPT Business, which includes ChatGPT Work (its agent), Codex for coding, deep research, image generation and connections to Google Workspace, Microsoft 365, Slack and GitHub. We cover it in depth in our ChatGPT Business guide.
- Claude (Anthropic). Opus 5.5, Sonnet 5.5 and Haiku 5.5, plus Fable on higher tiers. Claude Team includes Claude Code, Claude Cowork (the mode where Claude works with your files and tools), Docs, Slides and Microsoft 365 integration. In September 2026 Anthropic started merging Cowork and chat into a single Claude, rolling out to Pro and Max first and Team later. More in our Claude Cowork for business guide.
- Gemini (Google). Gemini 3.1 Pro and the new Gemini 4 Argon, which Google launched first on its paid consumer plans. For businesses it comes two ways: inside Google Workspace (Gemini in Gmail, Docs, Sheets, Meet and Drive) and as Gemini Enterprise, Google Cloud’s agent platform.
- Microsoft Copilot. What used to be Microsoft 365 Copilot is now called Microsoft Copilot. Copilot Chat is included at no extra cost with eligible Microsoft 365 licences, but it mostly works with the web and the files you give it (in Outlook it can also see your email and calendar). To work across all your email, files and meetings, inside Word, Excel, PowerPoint, Outlook and Teams, you need the paid licence (Copilot Business for up to 300 users). It uses OpenAI models and Anthropic models too, which are switched off by default in the EU and UK (more below).
How much does each one cost for a business?
| ChatGPT Business | Claude Team | Gemini in Google Workspace | Microsoft Copilot Business | |
|---|---|---|---|---|
| Price per user per month | $20 (annual) or $25 (monthly) | $20 (annual) or $25 (monthly) | Included in Workspace Business Standard and Plus | $21 list (annual), on top of Microsoft 365 |
| Higher-usage seat | Premium: $100 (annual) or $125 (monthly), 5x usage | Premium: $100 (annual) or $125 (monthly), 5x usage | Gemini Enterprise, from $21 per seat | n/a |
| Team size | From 2 users | 2 to 150 users | Up to 300 users on Business plans | Up to 300 users |
| Plan for larger companies | Enterprise, custom pricing | Enterprise: $20 per seat (annual, 20-seat minimum) plus usage at API rates | Workspace Enterprise | Microsoft Copilot (enterprise) |
| Trains on your data | No, by default | No, by default | No | No |
Prices as published on the vendors’ official pages in October 2026, before tax. Prices vary by country and currency: in Spain, for example, Workspace Business Standard is €13.60 per user per month and Copilot Business €18.20. Google offers introductory prices for the first users, and Microsoft is running a Copilot Business promotion until 31 December 2026 ($18 on an annual commitment). Prices change often, especially promotions and local prices, so always check the pricing page before you buy.
Compare like with like: if you already pay for Google Workspace Business Standard or above, Gemini costs nothing extra. If you already pay for Microsoft 365, Copilot is an added cost. And ChatGPT or Claude sit on top of whatever you pay for your office suite.
Which one is best for each task?
These are practical differences, not benchmark scores that go stale in weeks. On almost every task all four do a decent job; this is where you’ll notice the difference.
| Task | ChatGPT | Claude | Gemini | Copilot |
|---|---|---|---|---|
| Writing (emails, proposals, reports) | Very versatile, good sales tone | More natural long-form writing; follows style instructions closely | Handy inside Gmail and Docs | Handy inside Outlook and Word |
| Long documents (contracts, tenders, manuals) | Up to ~320 pages per request in reasoning mode (Business plan) | Context window of up to 1 million tokens, depending on the model | Strong with documents in Drive | Works with what’s in SharePoint and OneDrive |
| Data and spreadsheets | Data analysis, charts, and add-ins for Excel and Google Sheets | Claude for Excel, and spreadsheets built with Cowork | Gemini in Sheets | Copilot in Excel and the Analyst agent |
| Research | Deep research | Research, with cited sources | Deep Research plus Google Search | Researcher agent |
| Coding | Codex | Claude Code | Google Cloud tooling | GitHub Copilot (separate product) |
| Images and voice | Image generation, voice with video | Designs, slides and documents; not built for photo-style images | Images and video with Google’s models | Images and video with OpenAI models |
| Whole tasks (agents) | ChatGPT Work | Claude Cowork | Gemini Enterprise and Workspace Studio | Copilot agents and Copilot Studio |
Microsoft 365 vs Google Workspace: what usually decides it
For most small businesses, the question isn’t “which model is smartest” but “where do my email, files and meetings live?”
- If you use Google Workspace, Gemini is already in Gmail, Docs, Sheets, Meet and Drive from Business Standard upwards, at no extra cost. That’s the natural starting point. Note that Business Starter only includes Gemini in Gmail and Vids and basic access to the Gemini app.
- If you use Microsoft 365, Copilot lives inside the apps your team opens every day and respects the permissions you already have in SharePoint and Teams. But the free version (Copilot Chat) only sees the files you give it, plus your email and calendar in Outlook; to search across all your company’s content you need the paid licence.
- ChatGPT and Claude connect to both. ChatGPT Business connects to Google Workspace and Microsoft 365 and has add-ins for Excel, Word, PowerPoint and Google Sheets. Claude has connectors for Google Drive, Gmail and Google Calendar, plus Claude for Microsoft 365 (SharePoint, OneDrive, Outlook and Teams).
The built-in tool has a clear advantage: your team doesn’t have to switch screens. The standalone tool has one too: it doesn’t tie you to one ecosystem and is often ahead on complex tasks. That’s why so many companies end up combining them.
Agents: ChatGPT Work, Claude Cowork, Gemini and Copilot agents
All four have moved from answering questions to doing whole tasks: opening files, querying tools, preparing a report and saving it in the right folder. If you’re not sure what an agent is, start with our guide to what an AI agent is.
- ChatGPT Work (launched in July 2026) works across your apps and files (in the desktop app, also local files and desktop apps, if your admin allows it), breaks a project into steps and delivers spreadsheets, slides or documents. You can schedule recurring tasks and build agents for your team.
- Claude Cowork works directly in the folders and tools you choose, asks for approval before significant steps and can keep going after you close your laptop. Claude Code is its counterpart for coding.
- Gemini Enterprise is Google’s agent platform: it connects to more than 100 tools, including Microsoft 365, and respects each person’s permissions. Google notes that some features, such as delegating background tasks, are still in early access.
- Copilot ships ready-made agents (Researcher, Analyst) and lets you build your own with Copilot Studio.
An agent that acts on your files and tools needs clear limits: which folders it can reach, what it can change and who reviews what leaves the company. Decide that before you switch it on, not after.
Privacy, admin and EU data residency
There are more differences here than it seems, and almost no comparison covers them.
- None of them trains on business-plan data by default. On free and personal accounts they usually do unless you opt out. That’s the first gap to close.
- ChatGPT: full data residency (storage and model processing in the EU) is on Enterprise, not Business. Business is rolling out a choice of storage region, but it doesn’t cover processing and OpenAI keeps a temporary copy of prompts and responses in the US. Business includes SSO, an admin console and SOC 2 compliance.
- Claude: the Claude apps don’t process data in the EU. If you need European processing, Claude is available in AWS and Google Cloud European regions, and Anthropic says Cowork can run on your own cloud provider.
- Gemini: Workspace data regions are on the Enterprise plan, not the Business plans.
- Copilot: covered by Microsoft’s EU Data Boundary, but Anthropic models inside Copilot are excluded from it. That’s why they’re off by default in the EU and UK, and turning them on is an admin decision.
We go provider by provider in our guide to EU data residency for AI models under the GDPR. These terms change every few months, so confirm them in the contract before you decide.
Which one should your company choose?
- Your company runs on Google Workspace: start with Gemini, which you already pay for. If a specific team needs more (long-form writing, long-document analysis, coding), add Claude or ChatGPT for those people only.
- Your company runs on Microsoft 365 and lives in Excel, Outlook and Teams: pilot Copilot Business with a small group. If what you need is handing off whole tasks or working with long documents, compare it with Claude or ChatGPT in the same pilot.
- Teams that write a lot (law firms, consultancies, agencies, technical offices preparing tenders): Claude usually fits better. That’s what a Balearic group of companies decided after a structured discovery: most of its 75 mapped processes could be handled with Claude Cowork.
- Teams that want one tool for everything (marketing with images, sales, voice, research): ChatGPT Business is the most complete option.
- Teams with developers: Claude Code or Codex, whichever they work best with. Many use both.
- Sensitive data or EU residency requirements: choose the plan and setup that allow it before you choose the tool. Sometimes the answer isn’t a chat app at all, but a custom agent with models processed in Europe.
Why many companies end up using more than one
It’s the most common outcome, and it isn’t a planning failure. The office suite brings its built-in AI (Gemini or Copilot) for everyday work across the whole company, and one or two teams also use Claude or ChatGPT for the most demanding work. What doesn’t work is every employee choosing on their own: that means paying twice and losing control of your data.
Real use cases for small businesses
- Tenders and bid documents: the technical office uploads the tender documents, and the assistant summarises requirements, deadlines and scoring criteria and drafts a first version of the bid. In the group of companies we worked with, analysing large tenders went from up to two weeks to a few days.
- Quotes in high season: the assistant reads the requests that arrive by email and drafts the quote; a person reviews and sends it.
- Month-end close: finance points the agent at the folder of statements and budgets and gets back a reconciliation with variances flagged.
- Customer service: suggested replies based on the customer’s history and your terms, always reviewed before sending.
- Recurring reports: a scheduled task prepares the weekly report every Monday with data from several tools.
The risks of choosing and rolling it out alone
A bad choice doesn’t show in the first month. It shows in the invoice, in a data leak or in a tool nobody uses.
- Choosing by hype and paying for seats nobody uses. The most expensive mistake and the most common: buying 30 seats because “everyone’s talking about X” and finding out three months later that six people open it. Seats are billed every month, used or not.
- Every employee on their own personal tool with company data. Contracts, payroll or customer data pasted into free accounts that may be used for training, with no data processing agreement and no record of what was shared. When someone leaves, their conversations leave with them.
- Lock-in. If you build all your processes, instructions and agents inside one platform, switching later is costly. And the market shifts every few months: today’s leader may not be next year’s.
- Not checking where data is processed. Assuming “it’s the business plan, so it’s GDPR compliant”. EU residency is usually only on the top plans, and some features (such as Anthropic models inside Copilot) fall outside the European guarantees.
- Rolling it out without training. Untrained, people use it like a search engine, get disappointed and go back to the old way. And since February 2025 the EU AI Act requires companies to train staff who use AI.
- Switching on agents without limits. An agent with access to your folders and email can delete, send or share the wrong thing if nobody has decided what it may do and who reviews it.
An independent partner helps you choose based on your processes, not the marketing. You test before you buy, permissions and privacy are set up from day one, and your team is trained on its own use cases.
Not sure which one fits your company? Book a free call and we’ll look at it with your real processes.
How we do it at Aitomatik
We’re not tied to any one model. We pick the one that best fits each task:
- We start with your processes, not the tool. We sit down with each department, map which work can be handed off, and only then recommend a tool. For a Balearic group of companies we mapped 75 processes across 8 departments; the outcome was Claude Cowork and Claude Code, with a read-only gateway to their ERP that keeps credentials inside their network. The result: more than 1,600 hours a year freed up.
- We train the whole team. A general workshop first, then one session per department on its real use cases. That’s what turns paid seats into used seats. See our AI training for companies.
- The agents we build use more than one provider. We choose the model per task and always add a backup model from a different provider: if one fails, the system keeps running. For European clients, everything is processed in Europe, with zero data retention and no training.
- We connect your team’s ChatGPT or Claude to your systems through secure MCP servers, so they can query your CRM or ERP with each person’s own permissions. Read our guide to what MCP is.
Choose on evidence, not headlines
We help you decide between ChatGPT, Claude, Gemini and Copilot with a pilot on your real processes, set it up with your data protected, and train your team so they actually use it. See our AI and automation consulting service or book a free call.
Frequently asked questions
Is Claude better than ChatGPT for business? For long-form writing, long documents, coding and handing off tasks on your files, many teams prefer Claude. For a single tool that does almost everything (agent, images, voice, research), ChatGPT. Their business plans cost practically the same, so the best test is your own tasks.
Is Gemini better than ChatGPT? It depends on where you work. If your company uses Google Workspace, Gemini is already inside your tools at no extra cost. ChatGPT is more versatile as a standalone tool and has more features (agent, images, voice, Excel and Google Sheets add-ins).
Which AI chatbot is best for business? The one that fits your office suite, your data requirements and your team’s main tasks. For most companies that means the AI built into Google Workspace or Microsoft 365 for everyone, plus Claude or ChatGPT for the teams that need more.
Is ChatGPT or Copilot better for a company on Microsoft 365? Copilot works inside Word, Excel, Outlook and Teams with your files and permissions. ChatGPT Business is more versatile outside those apps and also connects to Microsoft 365. If your team lives in Outlook and Excel, pilot Copilot first.
Can I use Gemini for my business? Yes. It’s included in Google Workspace (in Docs, Sheets and Meet from Business Standard), and Gemini Enterprise covers more advanced agents. Always use business accounts, not personal ones.
Can we use more than one? Yes, and most companies do. The key is deciding it as a company: which tool each team uses, with which data and on which accounts.
Prices and features checked on the official OpenAI, Anthropic, Google and Microsoft pages. They change often, so confirm them before you buy. Last reviewed: 15 October 2026.
