All four are good now. The gap between the best and the worst AI chat tool is much smaller than the gap between a team that uses one well and a team that doesn’t use one at all. So the real question isn’t “which is smartest”. It’s which one fits the tools you already work in, and which one you’ll actually open every day.
I use all four in client work. This is how I’d choose for a small business, with prices checked in October 2026. Prices and limits change every few months, so confirm on each pricing page before you buy.
The short answer
| If your business… | Start with | Why |
|---|---|---|
| Runs on Microsoft 365 (Outlook, Word, Excel, Teams) | Copilot | It works inside the files and email you already have |
| Wants one all-round assistant for everyone | ChatGPT | Widest set of features, easiest for non-technical staff |
| Writes a lot: proposals, policies, long reports | Claude | The most natural writing and the best at long documents |
| Wants AI that does tasks, not just chats | Grok (with Grok Bot) | Grok Bot can work in your real tools on a schedule |
None of these is a wrong choice. If you’re unsure, pick one, use it for a month on real work, and only then decide whether you need a second.
What each one does best
ChatGPT (OpenAI)
The default for a reason. It handles writing, summaries, spreadsheets, images and voice in one place, and most staff have already tried it at home, so there’s almost no training needed.
- Good at: everyday writing, quick research, analysing a spreadsheet you upload, brainstorming, image creation.
- Watch out for: confident answers that are wrong in the details. Always check figures, dates and anything legal or tax-related.
- Business plan: ChatGPT Business is about $20–25 per user a month (cheaper on annual billing), minimum two users. Business data isn’t used for training by default.
Claude (Anthropic)
The one I reach for when the writing has to sound like a person, or when the document is long. It reads a 60-page contract or a whole policy manual and answers questions about it without losing the thread.
- Good at: client emails that don’t sound like AI, proposals, rewriting policies in plain English, summarising long PDFs, careful step-by-step reasoning.
- Watch out for: fewer extras than ChatGPT (for example, image creation), and usage limits you can hit on heavy days on the cheaper plans.
- Business plan: Claude Team is about $20–25 per seat a month, with a higher-usage seat at around $100–125. Team data isn’t used for training.
Grok (xAI)
Fast, direct and strong on current events, because it can search the web and X in real time. Its bigger advantage for a business is Grok Bot: an assistant that works on its own cloud computer, opens your tools, prepares drafts and runs routines on a schedule, asking your approval before anything sensitive.
- Good at: up-to-date research, quick answers, and (with Grok Bot) repeat tasks like a morning inbox summary or weekly client reminders.
- Watch out for: a newer business offering than the others, so check the admin and data controls match what you need.
- Business plan: Grok Business is listed at about $30 per seat a month. Individual SuperGrok plans start lower. xAI says Business data isn’t used for training. Grok Bot is included with some plans; see the Grok Bot setup guide for how it works.
Microsoft Copilot
If your files live in OneDrive and SharePoint and your email is Outlook, Copilot’s big strength is that it already knows your work. Ask it to summarise last week’s emails with a client, draft a reply, or build a table in Excel from a messy export, and it does it where you are.
- Good at: working inside Outlook, Word, Excel, PowerPoint and Teams, meeting summaries, finding things in your own files.
- Watch out for: it’s only as good as how your Microsoft 365 is organised. If permissions are messy, Copilot can surface files people shouldn’t see. Fix sharing settings first.
- Business plan: free Copilot Chat comes with Microsoft 365 business plans. The full Microsoft 365 Copilot Business add-on is about $21 per user a month on annual billing (promotional prices have run lower in 2026), and needs a Microsoft 365 business plan underneath.
Side by side
| ChatGPT | Claude | Grok | Copilot | |
|---|---|---|---|---|
| Best at | All-round use | Writing, long documents | Live research, doing tasks | Microsoft 365 work |
| Business price (approx.) | $20–25 / user | $20–25 / seat | ~$30 / seat | ~$21 / user add-on |
| Free version | Yes | Yes | Yes | Copilot Chat |
| Works inside your apps | Connectors | Connectors | Connectors + Grok Bot | Built into Microsoft 365 |
| Business data used for training | No (business plans) | No (Team) | No (Business) | No |
Prices are per month, in US dollars, as of October 2026. “No training” applies to the business plans, not necessarily to free personal accounts.
The privacy rule that matters more than the tool
The biggest risk isn’t which AI you choose. It’s staff pasting client data into a free personal account, where the rules are different and you have no control.
- Pay for one business plan and ask everyone to use it for work.
- Never paste ID numbers, bank details or passwords into any AI tool.
- Keep a person checking anything that goes to a client, especially numbers and advice.
Accounting and tax firms should read the safety rules in 30 AI prompts for accountants before rolling anything out.
How to choose in one week
- Day 1: list the five tasks your team repeats most (replying to emails, writing proposals, chasing documents, meeting notes, reports).
- Days 2–5: try two of the tools on those same five tasks, using the free versions with made-up details.
- Day 6: compare which answers needed the least fixing, and which tool people actually reached for.
- Day 7: buy one business plan for the people who’ll use it. Add a second tool later only if there’s a clear gap.
If you don’t know where to start, 10 practical ways to use AI this week gives you ready tasks to test with.
When chat isn’t enough
All four tools wait for you to ask. The next step is AI that does the routine work on its own and asks you to approve it: preparing reminder emails every Monday, summarising new leads, or flagging overdue invoices. That’s where an agent like Grok Bot comes in, or an automation tool such as n8n, Zapier or Make connected to whichever AI you chose. For a worked example in an accounting practice, see how an AI assistant for accounting firms runs your daily work.
If you’d like help picking and setting this up for your team, get in touch.
