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Guide · For business leaders

ChatGPT vs Copilot vs Claude vs Gemini.

A plain-English guide to the four AI assistants your team is probably already using. What each one is good at, where it falls down, and how to pick the right combination for your business.

There is no single winner. There is only the right tool for the job you are doing.

The most common question I get after a keynote is some version of, "so which one should we actually use?" It is a fair question and the honest answer is that most organisations end up using two or three of these tools together, not one.

The four assistants below cover the vast majority of what businesses need. They are all capable. The differences that matter are less about raw intelligence and more about where they sit, who owns your data, and how they fit the way your team already works.

The four assistants at a glance
OpenAI

ChatGPT

The best general-purpose assistant and the easiest place to start.

Strengths
  • Strongest all-round model (GPT-5 class) for reasoning, writing and code
  • Excellent voice mode, image generation and file analysis in one place
  • Custom GPTs let you build reusable assistants without code
Watch out for
  • Not natively inside Microsoft 365 or Google Workspace
  • Free tier data can be used for training unless you opt out or use Team/Enterprise
Typical UK pricing
Free · Plus £20/mo · Team ~£25/user/mo · Enterprise on request

If you are picking one assistant for a mixed team, this is the safe default.

Microsoft

Microsoft Copilot

Best if your organisation already lives in Microsoft 365.

Strengths
  • Sits inside Word, Excel, Outlook, Teams and PowerPoint
  • Can read your email, files, chats and meetings with your permissions
  • Enterprise data stays inside your Microsoft 365 tenant
Watch out for
  • The underlying model is capable but has historically trailed ChatGPT on raw reasoning
  • Quality depends heavily on how tidy your SharePoint, Teams and email data is
Typical UK pricing
Copilot Pro £19/user/mo · Microsoft 365 Copilot ~£24.70/user/mo

The productivity multiplier for Microsoft-first organisations. Weakest as a standalone chatbot.

Anthropic

Claude

Best for long documents, careful writing and sensitive drafting.

Strengths
  • Excellent at long-form writing, editing and nuanced tone
  • Very large context window, handles book-length documents comfortably
  • Strong safety posture, popular in legal, HR and professional services
Watch out for
  • No native image generation
  • Smaller ecosystem of plugins and integrations than ChatGPT
Typical UK pricing
Free · Pro £15/mo · Team from ~£24/user/mo · Enterprise on request

The thoughtful writer. Pair with ChatGPT or Copilot rather than replacing them.

Google

Gemini

Best if your organisation lives in Google Workspace.

Strengths
  • Built into Gmail, Docs, Sheets, Slides and Meet
  • Deep integration with Google Search and YouTube
  • Strong at multimodal tasks, especially images and video
Watch out for
  • Quality has been uneven release-to-release, though Gemini 2 closed most of the gap
  • Less useful if your business is not on Google Workspace
Typical UK pricing
Free · Gemini Advanced £18.99/mo · Workspace add-ons from ~£17/user/mo

The obvious choice for Google-first teams. A capable second opinion for everyone else.

Which one for you?
  1. Scenario 01

    You run a UK SME on Microsoft 365

    Start with Microsoft Copilot for productivity and add ChatGPT Team for the handful of power users who need a stronger standalone model.

  2. Scenario 02

    You run a UK SME on Google Workspace

    Turn on Gemini in Workspace for the whole team and let heavy users trial ChatGPT or Claude on top.

  3. Scenario 03

    You are a professional services firm (legal, accounting, consulting)

    Claude for drafting and review, ChatGPT for research and analysis, and whichever office suite Copilot you already own for day-to-day tasks.

  4. Scenario 04

    You are an individual or a very small business

    One paid ChatGPT Plus seat covers 80 percent of what most people need. Add a free Claude account for longer documents.

  5. Scenario 05

    You are a marketing or creative team

    ChatGPT for ideation and image generation, Claude for long-form copy, Gemini for anything tied to Search or YouTube.

A few things worth knowing

Free tiers train on your data. Paid tiers usually don't.

If the assistant is free and you have not changed the settings, assume your prompts can be used to improve the model. Business and enterprise plans contractually keep your data out of training. This matters more than the price difference.

Model rankings change every quarter.

Whichever assistant is 'best' today will be second by next quarter, and back on top the quarter after. Pick on ecosystem fit and data governance, not on this month's benchmark scores.

Your policy matters more than your product choice.

What people are allowed to paste in, what has to be checked before it goes out, and who owns the output. Get this in writing before you scale usage. There is a free workplace AI policy template in the members portal.

Two assistants beat one.

A second opinion from a different model is one of the simplest quality controls you can put in place. Draft in one, sanity-check in another. It takes 30 seconds and catches a surprising amount.

See also
Getting Started with AI →Human Firewall 2.0 →