ChatGPT vs Microsoft 365 Copilot: Which is right for your organisation?

Staff are already using AI to draft emails, explore ideas and make sense of information. For IT leaders, the question is no longer whether to adopt AI, but which tools to approve, how to govern company data and where to spend the licensing budget.

The short answer to ChatGPT vs Microsoft 365 Copilot is that the right choice depends on where your work and data live, and how you need to govern them. Microsoft 365 Copilot is a natural candidate for work centred on Microsoft 365; ChatGPT Business or Enterprise may suit teams working across different tools. A combination can make sense, provided each licence solves a distinct need.

Key takeaways ·       Choose around your workflows, data sources and governance requirements, not the brand name alone. ·       ChatGPT consumer accounts differ from Business and Enterprise: business workspace data is not used to train OpenAI’s models by default. ·       Copilot Chat is included with eligible Microsoft 365 subscriptions, but the paid Microsoft 365 Copilot experience adds grounding in your organisation’s work data and deeper app integration. ·       Pilot before scaling, address oversharing and assign both tools only where the additional value justifies the cost.

Understanding the two products

ChatGPT: consumer plans vs Business vs Enterprise

ChatGPT is OpenAI’s AI assistant for tasks such as writing, research, analysis and coding. The important buying distinction is between a personal subscription and an organisation-managed workspace. A paid consumer plan is not the same as an enterprise deployment.

On consumer plans, including Free, Go, Plus and Pro, content may be used to improve models depending on the user’s settings. Users can opt out, but that does not give IT the central oversight or contractual arrangements of a business workspace. ChatGPT Business provides shared administration and billing; ChatGPT Enterprise adds more extensive governance and contractual options. OpenAI does not train on Business or Enterprise inputs and outputs by default. Review each plan’s retention, identity, audit and data residency provisions rather than assuming they are identical.

ChatGPT can work with uploaded files and approved connected sources, subject to plan, permissions and administrator settings. Connecting a service requires its own security review: do not assume Microsoft 365 policies automatically carry across every third-party integration. See OpenAI’s enterprise privacy commitments and consumer and business training-data rules.

Microsoft 365 Copilot: Copilot Chat, agents and licensing

Microsoft 365 Copilot brings AI into Microsoft 365 workflows, including Word, Excel, PowerPoint, Outlook and Teams. Its paid experience can ground responses in work information such as emails, meetings, chats and files that the user is authorised to access. It is not simply ChatGPT with a Microsoft logo: the integrations, data access, administration and commercial terms differ. For practical examples, see seven everyday tasks made easier with Microsoft 365 Copilot.

Copilot Chat is available at no additional licence cost to users with an eligible Microsoft 365 subscription and a Microsoft Entra work account. It provides enterprise-protected, web-grounded chat and can use supplied content; some in-app access depends on the subscription and rollout. It is not equivalent to the paid experience’s broader work-data reasoning. Compare Copilot Chat with and without the paid licence before assuming that every user needs an add-on.

Copilot Studio provides tools to create and manage agents that use selected knowledge sources and carry out defined tasks. Agents need approved connections, clear ownership and limits on what they can do. Some usage is included with qualifying Copilot licences; other scenarios require metered billing or capacity. Check the agent, channel and usage terms rather than treating all automation as included.

For the Microsoft 365 Copilot add-on, each user needs an eligible underlying subscription and the appropriate assigned licence. Eligible plans include Microsoft 365 Business Basic, Standard and Premium, and enterprise options such as Microsoft 365 E3 and E5; available functionality also depends on the services in the base plan. Bundles and business-specific offers may differ. Verify current licensing prerequisites and include base subscriptions, agent consumption and any additional security tooling in the budget.

A note on naming: “Copilot” describes several Microsoft offerings, not one interchangeable licence. This article uses Microsoft 365 Copilot for the paid workplace experience and Copilot Chat for the included workplace chat offering. Consumer Microsoft Copilot and GitHub Copilot are separate products. “ChatGPT” also needs a plan name when discussing company data or procurement.

ChatGPT vs Microsoft 365 Copilot at a glance

Buying criterion	ChatGPT Business / Enterprise	Copilot Chat	Microsoft 365 Copilot
Best for	Cross-tool research, drafting, analysis and technical or creative work.	Governed general AI chat for eligible Microsoft 365 users.	AI assistance grounded in Microsoft 365 work and embedded workflows.
Where it works	ChatGPT web and apps; approved connected tools and features vary by plan.	Work chat and selected Microsoft 365 app experiences, depending on entitlement.	Work chat and Microsoft 365 apps, including Word, Excel, Outlook and Teams.
Data grounding	Prompts, uploads, web sources and enabled business connections.	Primarily web and supplied content; agents can extend access under separate terms.	Web and permitted organisational context through Microsoft Graph and connected sources.
Admin controls	Managed workspace; Enterprise offers more extensive retention, audit and access options.	Enterprise data protection and tenant administration; controls depend on underlying licences.	Microsoft 365 identity, permissions and supported compliance controls; additional licences may be needed.
Models	OpenAI models and tools; availability and usage limits depend on the plan.	Microsoft-managed model access; availability and limits vary.	Model choice in supported experiences; availability depends on feature, tenant and configuration.
Pricing model	Business per-seat plans with usage limits and optional extra usage; Enterprise pricing by agreement. API costs are separate.	Included with eligible subscriptions; some agent usage is metered separately.	Per-user add-on or qualifying bundle; base licences and some advanced usage add to total cost.

Both suppliers provide business-data protections, but neither product is a blanket guarantee of compliance or accuracy. Microsoft states that workplace Copilot prompts, responses and Microsoft Graph data are not used to train foundation models. Controls vary by licence and configuration. Consult Microsoft’s enterprise data protection details and current model and feature availability alongside OpenAI’s plan documentation.

Which is right for your organisation?

Microsoft 365-centric organisation. If everyday work happens in Teams, Outlook, SharePoint and Office documents, start by testing Microsoft 365 Copilot on tasks that need that context. Examples include preparing a meeting brief from permitted emails and files, or drafting a document from approved sources. Use Copilot Chat for users whose needs do not justify the paid licence.

Mixed-tool, technical or creative teams. Evaluate ChatGPT Business or Enterprise where work spans multiple systems, coding, open-ended research or iterative content development. Test realistic tasks and approved connections rather than assuming either assistant is universally better. A ChatGPT subscription does not automatically include API usage for bespoke applications.

Regulated sector. Start with the control requirements, not a preferred tool. Compare contractual commitments, retention, audit evidence, data location, subprocessors, access controls and the proposed use case. Microsoft 365 Copilot may fit an established Microsoft governance environment; ChatGPT Enterprise may meet cross-tool needs where its controls satisfy the assessment. Neither choice removes your organisation’s obligations.

Small team or limited IT capacity. Keep the first deployment narrow. An included Copilot Chat entitlement or a managed ChatGPT Business workspace may provide a starting point, depending on the systems you already use. Confirm that someone can own accounts, permissions, policy and support. A lower licence price is not a saving if administration and review are left undone.

Decision checklist

• Where does your data live? Identify the repositories and applications required for the priority tasks, and confirm supported connections.
• What governance is mandatory? Specify identity, permissions, retention, audit, sharing and incident-response requirements.
• What is the full licensing budget? Include base subscriptions, seats, consumption, integrations, security controls, training and support.
• What do users need to achieve? Test representative workflows, output quality and accessibility, not just impressive demonstrations.
• What must compliance approve? Agree permitted data categories, contractual terms, relevant sector rules and launch conditions before connecting sensitive sources.

Can you use both?

Yes. A combination can make sense when Microsoft 365 Copilot supports work inside Microsoft 365 and ChatGPT addresses a distinct cross-tool, technical or creative requirement. Define which tool is approved for each task and data category. Moving content between assistants creates another data flow that needs review; approval for one workspace is not automatic permission to copy its information elsewhere.

To avoid duplicated spend, assign licences by demonstrated need rather than giving everyone both. Compare overlapping capabilities using the same test tasks, track active use and outcomes, and review seats before renewal. Keep a single inventory of owners, subscriptions, agents and connected data sources.

Address shadow AI directly. Staff using personal accounts can put company information outside approved controls. Publish an acceptable-use policy that names approved tools and accounts, permitted and prohibited data, checking requirements and an incident-reporting route. Provide a usable approved alternative and explain the reasons for restrictions. Back policy with proportionate technical controls and regular training.

Readiness and risks before you roll out

Permissions and oversharing. Copilot respects existing access rights, but overly broad access can make information easier to discover. Review SharePoint and Teams membership, shared links, guest access and stale content before connecting work data. Apply the same least-privilege approach to ChatGPT connections and agents. Give each knowledge source an accountable owner.

Data classification and protection. Define what is public, internal, confidential or restricted, then translate those categories into permitted AI uses. Check sensitivity labels, data loss prevention, sharing, retention and deletion settings where supported. Review external apps and agent actions separately, as connected content can contain misleading instructions or requests to disclose information. For more on the data foundations behind safe adoption, read why trusted data is the foundation of responsible AI.

Accuracy and human review. Both tools can generate plausible but incorrect answers. Require users to check sources, calculations, dates and context before relying on an output. Use stronger review for customer-facing material or consequential decisions, and require explicit approval before agents take sensitive actions. A linked source does not prove that the generated answer represents it correctly.

UK GDPR and sector obligations. Where AI tools process personal data, UK GDPR still applies. Consider lawful basis, transparency, data minimisation, retention, processor terms, international transfers and individuals’ rights, and whether a data protection impact assessment (DPIA) is needed. Regulated sectors may also have their own confidentiality and regulatory duties to factor in. Supplier certifications support due diligence, but they do not make a deployment compliant on their own. The ICO’s guidance on AI and data protection is a useful starting point; check it for the latest updates.

Rolling out AI successfully

Pilot. Select a small, representative group and a handful of approved use cases. Establish a baseline for task time and output quality, complete the data and security checks, and define what success must look like before assigning licences. Test with realistic but appropriately protected information.

Measure. Track task completion time, quality after human correction, rework, active usage, user confidence, support demand and policy incidents. Compare cost per successful task, including review time and consumption charges. Time saved only becomes value when it improves capacity, service or another agreed outcome.

Scale. Expand only the use cases that meet the agreed quality, governance and value thresholds. Provide role-based training on prompting, source checking, data handling and approved workflows. Use champions, drop-in sessions and reusable examples to support adoption, then review permissions, licences and product changes regularly.

How OneAdvanced can help

Choosing an AI assistant is only one part of building a secure, productive workplace. OneAdvanced’s Digital Workplace Services help organisations manage, secure and get more from Microsoft 365, while our AI and Data Services help build the data foundations needed to adopt AI with confidence.

For AI built into sector-focused workflows, explore OneAdvanced AI. To protect your wider environment with monitoring, threat detection and response, see our Managed Cybersecurity services.

To plan your next step, speak to OneAdvanced about your current environment, priority use cases and governance requirements.

Frequently Asked Questions

Is Microsoft 365 Copilot the same as ChatGPT?

No. They are separate products with different interfaces, integrations, controls and licence terms. ChatGPT is OpenAI’s assistant; Microsoft 365 Copilot integrates AI with Microsoft 365 work and applications. Do not assume they use identical models or deliver identical results.

What is the difference between Copilot Chat and Microsoft 365 Copilot?

Copilot Chat provides enterprise-protected AI chat at no additional licence cost for eligible Microsoft 365 users, primarily using web and supplied content. The paid Microsoft 365 Copilot experience adds broader reasoning over permitted work data and deeper integration across Microsoft 365 apps. Included in-app access, agents and usage limits depend on the licence and configuration.

Is ChatGPT safe to use with company data?

It depends on the plan, data and controls. Business and Enterprise content is not used to train OpenAI’s models by default, but that alone does not approve every use. Use an organisation-approved workspace, review retention and connected apps, and follow your data-handling policy. Do not put confidential company information into personal accounts without explicit approval.

Do I need a Microsoft 365 licence to use Copilot?

For the workplace offerings discussed here, yes: Copilot Chat requires an eligible subscription and work account, while the paid Microsoft 365 Copilot add-on requires a qualifying base plan. Some bundles include the paid entitlement. Consumer Microsoft Copilot is separate and is not a substitute for an approved workplace deployment.

Can we use ChatGPT and Copilot together?

Yes, where each addresses a distinct requirement. Set a common policy for data, review and connected sources, and allocate licences by use case. Measure the additional benefit before paying for overlapping subscriptions for the same users.