Copilot vs ChatGPT for a property firm: which one to buy

The short answer. If your firm runs on Microsoft 365 and the work you want help with lives in Outlook, Word, Excel and SharePoint, start with Copilot, because it sits inside those apps and inherits the permissions you already have. If you want the strongest general drafting and reasoning and you are happy to paste work into a separate window, ChatGPT. Most firms of any size end up running both, with Copilot across everyone and a handful of ChatGPT seats for the people who push hardest. That is a sensible outcome, not a failure to decide.

The comparison articles ranking for this question are mostly written by resellers of one product or the other, and almost none of them mention the two things that decide it in practice: what your existing licence forces on you, and the state of your SharePoint permissions.

What each one is for

Copilot is AI where your work already is. ChatGPT is AI in its own window that you bring work to.

That sounds like a small difference and it is the whole difference. Copilot's pitch is context: it sees your mailbox, your files, your calendar and your Teams messages, so a question like "summarise where we got to with this landlord" has something to work from. Microsoft states that it "inherits your Microsoft 365 permissions, sensitivity labels, and retention policies" (Microsoft), so a user sees what they were already entitled to see.

ChatGPT starts with none of that and gives you a stronger, more flexible general model to work with. You paste in the lease, the notes, the spreadsheet. For long reasoning tasks, awkward drafting and anything analytical, most people who use both will tell you it is the better instrument, at the cost of the friction of moving work in and out.

For a property firm, that trade lands in a specific place. Property work is document-heavy and inbox-heavy, and most of the documents are already in Microsoft. That biases the answer towards Copilot for the everyday, with ChatGPT earning its seat on the harder, less frequent jobs.

What it costs

Microsoft publishes UK pricing; check the figures yourself before you commit, because they move and because promotional rates expire.

As at 12 August 2026, on Microsoft's own UK pages:

Microsoft 365 Copilot Business, the add-on, is advertised at "Originally starting from £16.10 now starting from £13.80 user/month, paid yearly", or £19.32 on a monthly commitment. Microsoft states "A Microsoft 365 Business plan is required" (Microsoft 365 Copilot pricing).
Bundled, Business Standard with Copilot is £18.10 and Business Premium with Copilot is £24.60 per user per month, paid yearly (Microsoft 365 Business plans).
Microsoft 365 Copilot on the enterprise page is £23.10 per user per month, paid yearly (Microsoft 365 Copilot enterprise pricing).
All of those prices exclude VAT.

For ChatGPT, go and read OpenAI's current pricing directly. Business and enterprise tiers are priced per user with different admin controls at each level, and the numbers have changed more than once. I am not quoting a figure I have not checked today, and neither should the reseller emailing you.

The number that matters is not the headline price anyway. It is the price multiplied by the people who will use it in month three. Ten seats that get used beat forty that do not.

The two things that quietly decide it

Your existing licence. Copilot sits on top of a Microsoft 365 subscription, and the SKU you already hold constrains what you buy. Microsoft's Business plans are "Available for up to 300 users" (Microsoft), so a growing firm crossing that line moves onto enterprise licensing and a different price. Firms on Business Basic have no desktop apps, which changes what an in-app assistant is worth. And a firm that grew by acquisition often has three licence types across four offices, which is worth untangling before anyone buys AI on top of the mess.

Your SharePoint permissions. This is the one nobody warns you about. Copilot inheriting your permissions is a genuine safeguard and it is also the catch: if a decade of loose sharing means half the firm technically has access to the folder with the partner drawings, the salary review or the sensitive client file, Copilot will find it and surface it in an answer. It has not broken anything. It has revealed what was already true. Property firms with long-lived shared drives are exactly the profile where this bites. Audit sharing before you roll out, not after someone asks Copilot an innocent question and gets an uncomfortable answer.

What Microsoft and OpenAI say about your data

Both say business-tier data is not used to train their models. Read the current terms for the specific tier you are buying rather than the marketing page.

Microsoft states that with Microsoft 365 Copilot, "Prompts, inputs, and responses are never used to train the models" (Microsoft). OpenAI makes an equivalent commitment for its business and enterprise tiers; read it on their site as it stands when you buy, because the answer differs by tier and the free consumer tiers are not the same deal.

Two practical points that matter more than either statement. First, the tier is what counts. A team member using a personal free account with client documents is a different risk from the same person on a firm-managed business seat, and that is a training and policy problem rather than a procurement one. Second, get whatever matters to you into your written policy. If you handle information where residency, retention or confidentiality obligations bite, check the specific position for the tier you are buying and put the answer in writing before rollout.

How I would decide it in a property firm

A short version, in order.

Are you on Microsoft 365 and is your work in it? If yes, Copilot is the default starting point, because adoption is the hard part and an assistant living inside Outlook gets used.
Is your SharePoint tidy? If no, fix that first. This is a genuine prerequisite, not a nice-to-have.
Buy a pilot, not a rollout. Ten to fifteen seats across your busiest desks for a quarter. Measure usage weekly. Anyone not using it after four weeks loses the seat to someone on the waiting list.
Add a few ChatGPT seats for the heavy users. The people doing long-form analysis, complex drafting and research will notice the difference, and they are the ones who bring the good ideas back.
Train before you scale. Firms that buy licences and send an email get single-digit adoption. Firms that run a session on people's own work get the opposite. This is the step that decides whether the spend was worth it, and it is the one that gets skipped.

The tool question is genuinely less important than it looks. The habits transfer. Someone who learns to brief AI well on Copilot is good at ChatGPT within a day. What does not transfer is a team that never got shown how, which is why the licence choice is the smallest decision in this article.

Frequently asked questions

Which is better for a small property firm? Copilot, in most cases, because it works inside the apps your team already lives in and adoption is the thing that fails. The exception is a firm whose work does not sit in Microsoft, or one wanting a small number of people doing heavy analytical work, where ChatGPT gives more for the money.

Do we need both? Not to start. Many firms arrive there, with Copilot broadly and a few ChatGPT seats for power users. Start with one, learn what your team does with it, and add the second when someone makes a specific case.

Is Copilot included in our Microsoft subscription? Microsoft 365 Copilot is a paid add-on. A separate, more limited Copilot Chat is described by Microsoft as "available at no additional cost for all Microsoft Entra account users with an eligible Microsoft 365 subscription" (Microsoft). What is included has changed more than once, so check your own tenant rather than an article.

Is it safe to put client information into either? On an approved business tier with the policy written down, firms do it routinely. On a personal free account, no. The difference is the tier and the policy, not the brand.

What if IT has only cleared Microsoft? Then start with Copilot and stop fighting it. The skills transfer, and a tool your team is allowed to use beats a better one they are not.

How do we know it was worth the money? Decide the measure before you buy. Hours back on a named job, response times on enquiries, how long a report takes. Firms that skip this end up arguing about a licence renewal with nothing but opinions.

If you want help picking, and more usefully getting your team to the point where the licence pays for itself, book a session.

Sources: Microsoft 365 Copilot pricing (UK); Microsoft 365 Copilot enterprise pricing (UK); Microsoft 365 Business plans with Copilot (UK); Microsoft 365 Copilot product page; OpenAI ChatGPT pricing. Microsoft prices quoted as published on 12 August 2026 and exclude VAT.