I get asked this more than anything except “is it safe?”. My honest answer surprises people: for a small business, the brand matters less than the setup. Pick one, put everyone on it properly, and you will get more out of it than a team split across three tools.

What all three now have in common

A year or two ago these were quite different products. Today, for business admin, the overlap is large:

  • Business plans that keep your data out of training by default. OpenAI says this of ChatGPT Business and Enterprise; Anthropic of Claude for Work; Microsoft offers enterprise data protection for Copilot used with a work account.
  • Connections to your email, calendar and files. Claude has connectors for Google Workspace and Microsoft 365. ChatGPT has apps for Gmail, Outlook, Google Drive and SharePoint, with admin controls on business plans. Copilot is built into Microsoft 365.
  • Admin control. On business plans, an owner decides who has access and which connections are switched on.

Where they differ

Copilot is the natural choice if your business runs on Microsoft 365. It sits inside Outlook, Teams, Word and Excel, and works within your existing Microsoft permissions. If your team never leaves Microsoft apps, that convenience counts for a lot. More on that in We’re on Microsoft 365. Should we just use Copilot?

Claude is what I lead with for writing, long documents and careful reasoning: proposals, reports, contract reading, tender documents. It connects to both Microsoft 365 and Google Workspace, so it suits mixed setups and Google businesses well.

ChatGPT is the most widely known, which matters for adoption: many of your staff will already be comfortable with it. It is a capable all-rounder with a large range of connected apps.

Model quality moves month to month, and any of the three is good enough for most admin work. The differences above are about fit, not which is “smartest”.

How I would choose

  1. Start from where your work lives. All Microsoft: look hard at Copilot. Google Workspace: Claude or ChatGPT. A mix: Claude or ChatGPT, which both connect to either.
  2. Look at what people already use. If half the team is fluent in one tool, that is worth something.
  3. Choose one, on a business plan. Company logins, the connections you need switched on, a two-page policy.
  4. Build so you can change. Keep your prompts, templates and automations written down in your own files, not locked inside one product, so moving next year is an afternoon rather than a project.

The bigger decision

The chatbot is the smaller part. The real gains come when AI is connected to the systems you already run, your inbox, job system and accounts, so it drafts the work for people to check. That is the same whichever brand you pick.