ChatGPT Enterprise vs Claude Enterprise vs Microsoft Copilot: Which Should Your Company Buy?

By Ivan Pylypchuk (opens in a new tab), CEO of Softblues. Has led Claude and Gemini implementations for finance, legal and healthcare teams across the UK and Ireland. Prices checked 13 October 2026.

The three enterprise AI platforms price on three different models, which is why comparing them on headline number alone is misleading. In the UK, Microsoft 365 Copilot lists at £23.10 per user per month on annual billing ($30 in the US), as an add-on to a qualifying Microsoft 365 plan (Microsoft UK, October 2026). Claude Enterprise starts at $20 per seat per month billed annually, with model usage billed separately at API rates; Anthropic does not publish a sterling Enterprise price (Anthropic, October 2026). ChatGPT Enterprise publishes no list price at all and is quoted by sales (OpenAI, October 2026).

At Softblues, an AI consulting firm working with regulated mid-market companies across the UK and Ireland, we deploy all three for clients and choose by fit rather than brand. We are Certified in the Claude Partner Network, so judge our preference for Claude accordingly; the comparison below is built on each vendor's own published documentation.

Key facts

• Microsoft 365 Copilot: £23.10/user/month on annual billing ($30 in the US), an add-on that needs a qualifying Microsoft 365 base licence, so the real per-seat cost is higher. Firms with up to 300 seats can instead buy Business Premium with Copilot at £24.60 (Microsoft, October 2026).
• Claude Enterprise: from $20/seat/month billed annually, plus usage at standard API rates, with a 20-seat minimum on the self-serve plan. Smaller teams can use Claude Team at £18/seat/month billed annually (Anthropic, October 2026).
• ChatGPT Enterprise: no published price; quote-only via OpenAI sales (OpenAI, October 2026).
• All three offer SSO, admin controls and "no training on your data" for business or enterprise tiers. That is now table stakes, not a differentiator.
• The decision is rarely about price. It is about where your work already lives, your connector needs, and your data-residency and audit requirements.
• Prices move. Every figure here was checked on 13 October 2026. Confirm the current quote with the vendor before you sign.

Who this is for, and who it isn't

This is for an IT, operations or finance lead at a 50-to-500-person UK or Ireland company choosing one enterprise AI platform to standardise on, who needs a procurement-grade view of seats, security, connectors and admin rather than a feature blog. If you are a single team wanting a few Pro seats to experiment, you do not need any of the enterprise tiers yet; start on the team plans and revisit this when you roll out company-wide.

Why can't you compare these three on price alone?

Because they bill on different units. Microsoft prices a flat per-seat add-on on top of a Microsoft 365 licence you may already pay for. Anthropic prices a low seat fee and then charges for what your people actually consume. OpenAI does not publish a number, so the only real figure is the quote you negotiate. A "cheapest" headline can become the most expensive option once you add base licences or heavy usage.

The honest way to choose is to start from where your work already happens. If your company runs on Microsoft 365, Copilot has a structural advantage because it sits inside the tools people already use. If you want the strongest general reasoning and a clean way to connect your own systems and documents, Claude is usually the stronger fit. ChatGPT Enterprise sits between the two, with the widest consumer familiarity.

---

How do the three enterprise plans compare on the things procurement cares about?

The table below is built from each vendor's published documentation, as of October 2026. Always confirm current terms with the vendor before you sign.

Figures and features as published by each vendor, checked 13 October 2026. Usage and negotiated terms vary.

What does each one actually cost once you add everything up?

Microsoft 365 Copilot. The £23.10 add-on is genuine, but it sits on top of a base licence. Microsoft 365 E7 bundles E5, Copilot and Agent 365 at £81.60 a user a month ($99 in the US), and firms with up to 300 seats can buy Business Premium with Copilot at £24.60 (Microsoft, October 2026). Since late September some Copilot features, including Cowork and the newest frontier models, draw on usage credits on top of the seat. If you already run E3 or E5, the marginal cost is the add-on plus any credits; if you do not, factor in the base licence.

Claude Enterprise. The $20 seat fee is low because usage is separate, billed at API rates that scale with the models your people use and how heavily they use them. For light users the all-in cost stays low; for heavy users it rises. Reported negotiated enterprise deals sit higher, around $60 a seat with seat and term minimums (market reports, 2026), so model your expected usage rather than trusting the $20 headline.

ChatGPT Enterprise. With no list price, the only honest answer is "get a quote". Third-party reports put negotiated deals in the region of $50 to $60 per user per month, but these are estimates, not published terms (market reports, 2026). Treat any specific figure as unconfirmed until OpenAI sends you one.

What 500 users cost on the published numbers. Copilot at £23.10 comes to about £138,600 a year, on top of the Microsoft 365 licences. Claude Enterprise at $20 comes to $120,000 a year before usage, which scales with how heavily people use it. ChatGPT Enterprise has no published number to multiply. So for 500 users the cheapest seat on paper is Claude, and the cheapest bill depends on usage and on what you already pay Microsoft.

Whichever platform you choose, the return depends on how many people use it every week. Our AI ROI calculator for your whole firm shows what that is worth.

Which should a regulated UK company buy?

For finance, legal and healthcare teams the deciding factors are usually data handling and auditability, and here the gap is narrower than the marketing suggests. All three offer enterprise terms that exclude your data from training, plus SSO and audit logging. Where they differ is in the depth of controls: Claude Enterprise publishes a Compliance API and customer-managed encryption keys; Microsoft gives you the Purview and Entra stack you may already govern; OpenAI offers enterprise controls but fewer published specifics.

Your compliance team will map this to the usual frameworks: the FCA and SM&CR in financial services, the SRA in legal, the CQC and clinical-safety standards in healthcare, and UK GDPR with the ICO across all of them. None of that is legal advice, but it sets the questions to ask each vendor about data residency, retention and a Business Associate Agreement if you handle health data.

We put our own company on Claude to run operations end to end, which is the closest thing we have to a worked reference; you can read how in our Claude operating-system case study. For a wider view of choosing any AI partner, our guide on how to choose an AI consulting firm in the UK covers the procurement angle, and our breakdown of AI consulting costs in the UK covers the services budget that sits alongside the licence.

---

What are the red flags when buying an enterprise AI platform?

• Choosing on headline price without counting base licences or usage. The cheapest sticker can be the dearest bill.
• Standardising company-wide before a pilot. Run a real pilot on your own data first.
• Ignoring where the work already happens. A platform your people have to leave their tools to use will see low adoption.
• Accepting "we don't train on your data" without reading the terms. It is true for these enterprise tiers, but confirm it in the contract, including sub-processors and retention.
• No exit plan. Check how you export your data and prompts if you switch.

What questions should you ask each vendor, and what does a good answer sound like?

1. What is the all-in per-seat cost for our actual usage? A good answer models base licence plus add-on, or seat plus expected usage, not just the headline.

2. Where is our data stored and for how long? A good answer names the region and the retention controls you can set.

3. Is our data ever used for training? A good answer is a clear contractual no, with the relevant clause.

4. How do SSO, SCIM and audit logging work with our identity provider? A good answer references your actual stack, Entra or otherwise.

5. What does switching away look like? A good answer explains data export without friction.

---

Frequently asked questions

Is Claude Enterprise cheaper than Microsoft Copilot?

On the seat fee, yes: Claude Enterprise starts at $20/seat/month versus Copilot's $30 (£23.10 in the UK) per user add-on. But Claude bills usage separately and Copilot needs a base Microsoft 365 licence, so the all-in comparison depends entirely on your licences and how heavily your team uses the models (figures checked 13 October 2026).

Why doesn't ChatGPT Enterprise publish a price?

OpenAI sells ChatGPT Enterprise through sales with custom terms, so there is no list price. Third-party reports estimate negotiated deals around $50 to $60 per user per month, but those are estimates, not published figures. The only reliable number is the quote OpenAI gives you.

Do any of them train on our company data?

On their business or enterprise tiers, no. Microsoft 365 Copilot, Claude Enterprise and ChatGPT Enterprise all exclude customer data from model training under their enterprise terms. Confirm the specific clause, retention period and sub-processor list in your contract.

Which is best for a Microsoft 365 company?

Usually Microsoft 365 Copilot, because it works inside Word, Excel, Outlook and Teams where the work already happens, which drives adoption. If you are not on Microsoft 365, that advantage disappears and Claude or ChatGPT may be the better fit.

Can we use more than one?

Yes, and many companies do, for example Copilot for everyday Office tasks and Claude for reasoning-heavy or custom-integrated workflows. The cost is running two contracts and two sets of governance, so most settle on one primary platform after a pilot.

How often does enterprise AI pricing change?

Frequently. All three vendors have adjusted plans and prices within the last year. Every figure here was checked on 13 October 2026; reconfirm with the vendor before a procurement decision.

If the question behind the comparison is what it would take to run the whole firm on AI rather than which seat to buy, that is the full AI-native platform guide, with the eleven worked examples. If the shortlist has already landed on Microsoft, the credit meter underneath the Copilot licence is the number that surprises finance directors.

---

Softblues is Certified in the Claude Partner Network and a Google Cloud partner at Services Select tier, and we deploy Claude, Copilot and ChatGPT for UK and Ireland clients based on fit, not loyalty. If you are choosing between enterprise AI platforms and want a vendor-neutral scoping conversation grounded in your existing stack, book a discovery call, or see how a Claude rollout looks in practice on our Claude deployment page.