Key Takeaways
- Choose Microsoft 365 Copilot when your most valuable work already lives in Outlook, Teams, Word, Excel and SharePoint.
- Choose ChatGPT Business when you need a flexible workspace for research, analysis, drafting, coding and work across several systems.
- Copilot's integration is its main advantage. ChatGPT Business's broad working environment is its main advantage.
- Do not compare licence price alone. Include the Microsoft 365 prerequisite, optional usage, rollout, training and permission clean-up.
- Run a small role-based pilot before buying licences for everyone.
Microsoft 365 Copilot is usually the better fit for a UK small business whose day already runs through Microsoft 365. ChatGPT Business is usually the better fit when the team wants a more flexible AI workspace for research, analysis, content, coding and work across different tools.
Neither is simply “better”. The correct choice depends on where your information lives and which repeated jobs you want to improve. If your team spends the day moving between Outlook, Teams meetings, Word documents, Excel files and SharePoint, Copilot's position inside those applications can be genuinely useful. If your work starts with an open question and involves several sources, formats or creative approaches, ChatGPT Business may feel less constrained.
This comparison is accurate to 18 July 2026. AI products and prices change quickly, so use the linked official pages to check the live position before purchasing.
The Short Decision
Choose Microsoft 365 Copilot Business if:
- Your company already uses an eligible Microsoft 365 Business plan.
- Email, meetings, documents and internal knowledge largely sit inside Microsoft 365.
- Staff want assistance within the applications they already use.
- Your IT owner is prepared to review SharePoint, Teams and file permissions.
Choose ChatGPT Business if:
- Your team works across Microsoft, Google, Slack, GitHub or other platforms.
- Research, reasoning, drafting, data analysis or coding are central use cases.
- You want Projects, shared business context, apps and a general AI workspace.
- You can define what staff may connect or upload and train them to use it well.
Consider a limited use of both if the roles are genuinely different. A development or research team may get more from ChatGPT Business while an operations team living in Microsoft 365 gets more from Copilot. That is different from paying twice for everybody.
Current Pricing for UK Buyers
Microsoft 365 Copilot Business
On 18 July 2026, Microsoft's UK Copilot Business page showed a promotional price of £13.80 per user per month, paid yearly, excluding VAT. Microsoft's terms say that promotion is available from 1 July to 30 September 2026, applies to the first year and requires an annual commitment.
The page also listed £19.32 per user per month, excluding VAT, for a monthly commitment. A qualifying Microsoft 365 Business plan is required, so the Copilot figure is not necessarily the whole software cost.
There is also Microsoft 365 Copilot Chat at no additional cost for eligible Microsoft Entra users, with limits and different access to work data. That can be a sensible starting point before adding paid licences.
ChatGPT Business
OpenAI's Business pricing page listed standard ChatGPT Business seats at US$20 per user per month when billed annually or US$25 per user per month when billed monthly on 18 July 2026. Standard workspaces require at least two users.
The price is shown in US dollars and may vary by country, currency and tax treatment. OpenAI also uses flexible credits for some advanced usage beyond included allowances. A ChatGPT Business subscription does not include API usage; API costs are separate.
Do not convert the price once and treat that as a guaranteed sterling bill. Check the actual UK checkout and decide how much variable usage you will allow.
Where Microsoft 365 Copilot Is Strongest
Copilot is built around the Microsoft 365 working environment. It can assist inside Word, Excel, PowerPoint, Outlook and Teams, using the signed-in user's work context where the licence and configuration allow it.
That matters because switching tools creates friction. A manager can work with an email thread in Outlook, a meeting in Teams or a document in Word without first copying everything into another chat window. Microsoft also offers organisation-level reporting and management tools that can help a business understand adoption.
Useful Copilot tasks may include:
- Summarising a long email conversation and identifying unanswered questions.
- Preparing a first draft from an existing Word document.
- Reviewing a Teams meeting and creating actions for the attendees.
- Helping a user explore a spreadsheet they already have permission to open.
- Finding information across authorised Microsoft 365 content.
The important limitation is permissions. Microsoft's architecture guidance says Copilot respects the signed-in user's existing access. That is good, but it also means a user may surface information that was already overshared through messy SharePoint or Teams permissions. Review access before rollout rather than assuming Copilot will tidy it for you.
Where ChatGPT Business Is Strongest
ChatGPT Business is a broader workspace. It is designed for conversations and tasks that may begin outside one office suite: research a market, compare documents, analyse a file, improve a process, draft several approaches, work with connected apps or help with code.
OpenAI currently includes tools such as Projects, apps, company knowledge, deep research and Codex within standard Business seats, subject to plan limits and flexible usage. That can make ChatGPT feel more useful for people whose work changes from hour to hour.
Useful ChatGPT Business tasks may include:
- Comparing several research sources and preparing a decision brief.
- Analysing uploaded data and explaining the result in plain English.
- Turning approved business material into drafts for different audiences.
- Building reusable team instructions and project context.
- Supporting technical work, debugging and coding through Codex.
The trade-off is that the team may need to bring the context into ChatGPT through uploads, apps or company knowledge. That creates useful flexibility, but it also means you need clear rules about which connections and information are appropriate.
Data, Privacy and UK Responsibilities
OpenAI's business-data page says Business inputs and outputs are not used to train its models by default. Microsoft says prompts and responses under its enterprise data protection are not used to train the underlying large language models, and that Microsoft 365 Copilot operates within the Microsoft 365 service boundary.
Those commitments matter, but they are only one part of safe use. Your business still decides:
- Which staff receive licences and admin rights.
- Which apps and data stores are connected.
- Whether personal or confidential information is appropriate for the task.
- How long information is retained.
- Who checks important output.
- How an error or incident is reported.
The ICO's AI guidance is relevant when personal data is involved. Our guide to protecting business data when using AI turns those concerns into a practical staff checklist.
Compare the Everyday Experience
Email and Meetings
Copilot has the natural advantage when the source is Outlook or Teams and the user has the correct access. ChatGPT can work with material provided or connected to it, but the experience may involve an extra step.
Documents and Presentations
Copilot's in-app position is useful when the team already produces Word documents and PowerPoint decks. ChatGPT Business can be strong at exploring structure, challenging an argument and creating alternatives, but the final work may still need to move into the office application.
Spreadsheets and Analysis
The right choice depends on the work. Copilot can help within Excel and the Microsoft context. ChatGPT can analyse files and support broader reasoning. Neither removes the need to check formulas, source data and assumptions.
Research and Open-Ended Work
ChatGPT Business often feels more natural when the task starts with a question rather than an existing Microsoft file. Deep research, projects and a flexible conversation can support exploration across a wider brief.
Coding and Technical Work
ChatGPT Business includes Codex access for standard seats under the current plan structure. That gives it a clearer position for software, debugging and repository work. Copilot Studio and Microsoft agents serve a different purpose: building and connecting business agents within the Microsoft ecosystem.
Administration and Adoption
Both products provide business administration, but the surrounding environment matters. Microsoft 365 administrators may find Copilot fits existing identity, access and compliance work more naturally. ChatGPT Business provides central billing, workspace administration, SSO and usage controls, but it is another workspace to govern.
The most expensive AI licence is the one nobody uses after the first month. Plan training, examples and ownership. Our AI training workshops focus on real jobs rather than a generic tour of buttons, and our guide to AI training for employees explains how to turn a pilot into a safe working habit.
A Better Way to Run the Trial
Do not ask staff which interface they prefer after ten minutes. Run a two-to-four-week pilot built around actual work.
Choose five tasks, such as:
- Summarise a real internal meeting and produce accurate actions.
- Turn an approved source document into a customer-facing first draft.
- Analyse a spreadsheet and explain the key movement.
- Find an answer from approved internal information and show its source.
- Complete one role-specific task, such as research, a proposal outline or technical review.
For each task, record the time taken before and during the pilot, output quality, correction time, failure cases and whether the result was actually used. Ask staff what context they had to prepare and whether the tool made the next step easier.
Test with a small group from the roles most likely to benefit. Do not use sensitive data merely to make the pilot feel realistic. If you need help choosing tasks and controls, start with AI strategy and consulting.
When Using Both Makes Sense
There are legitimate cases for both products, but allocate by role. A Microsoft-heavy finance or operations team may benefit from Copilot in its daily applications. A product, research or development team may get more from ChatGPT Business.
Set a review date. If a licence is not supporting real work, remove it. Two overlapping subscriptions create cost, policy and support overhead even when each price looks modest alone.
Frequently Asked Questions
Is Microsoft 365 Copilot or ChatGPT Business better?
Copilot is usually the better fit when most valuable work already lives in Microsoft 365 and staff need AI inside Outlook, Teams, Word, Excel and SharePoint. ChatGPT Business is often stronger as a flexible cross-tool workspace for research, analysis, drafting, coding and reusable team knowledge. The right answer depends on the jobs being improved.
How much does Microsoft 365 Copilot Business cost in the UK?
Microsoft's UK page listed a promotional price of £13.80 per user per month, paid yearly, excluding VAT, on 18 July 2026. The offer runs from 1 July to 30 September 2026 for the first year and requires a qualifying Microsoft 365 Business plan. It also listed £19.32 for a monthly commitment. Check the live page before buying.
How much does ChatGPT Business cost?
OpenAI listed standard ChatGPT Business seats at US$20 per user per month when billed annually or US$25 monthly on 18 July 2026, with a minimum of two standard seats. Regional currency, tax and optional flexible usage can change the final bill, so check the live checkout.
Can we use both Copilot and ChatGPT Business?
Yes, but do not automatically buy both for every employee. Pilot each tool with roles that have a clear use case, measure the difference and keep only the licences that produce enough value to justify the cost and governance overhead.
Will either tool keep our business data safe automatically?
Both vendors publish business-data protections, but safe use still depends on your permissions, configuration, staff behaviour, connected apps and policies. Copilot can surface information a user already has permission to access, so untidy Microsoft 365 permissions should be reviewed before rollout.
The Bottom Line
Copilot is the more natural choice when Microsoft 365 is already the centre of the business. ChatGPT Business is the more flexible choice when the work crosses systems and demands open-ended research, analysis, creation or technical support.
Buy for a job, not because a product is fashionable. Pilot with the people and information that reflect normal work, review the risks and measure whether the output was genuinely used.
If you want help choosing or rolling out the right option, get in touch. We can design a practical pilot, prepare staff guidance and recommend one product, both for selected roles or neither if the value is not there yet.
