Microsoft Copilot vs ChatGPT for Business (2026): Features, Pricing and Which to Buy

Short answer: Microsoft 365 Copilot is the better buy if your company runs on Outlook, Teams, Word and Excel. It costs $21 to $30 per user per month on top of Microsoft 365 and works inside those apps. ChatGPT Business, at $20 per seat, wins on raw model power, coding with Codex and tools outside Microsoft. Many teams end up using both.

That is the verdict in two sentences. The rest of this guide shows the prices, what each tool does for specific jobs, the security trade-offs, and what 100 seats really cost. Every price below was checked on vendor pages on November 4, 2026.

If you want the model-level comparison (GPT vs Claude vs Gemini), see our Gemini vs ChatGPT vs Claude breakdown. This piece is about the two workplace products you would actually buy seats for.

Microsoft Copilot vs ChatGPT at a glance

The index scores come from our Enterprise AI Platform Index, which rates 22 platforms on 29 sourced fields. Copilot scored full marks on security and agent capability. ChatGPT Enterprise lost most of its points on model choice (it offers only OpenAI models) and on pricing transparency (Enterprise is quote-only).

Pricing: what each plan costs in 2026

Sources: Microsoft enterprise pricing, Microsoft business pricing, Copilot Studio licensing, Microsoft 365 E7, OpenAI business pricing.

Two things the list prices hide. First, Copilot is an add-on: every price above assumes you already pay for Microsoft 365. ChatGPT is a standalone seat. Second, both vendors now meter heavy use. Microsoft bills Copilot Cowork, Autopilot and agents in Copilot Credits. OpenAI says that starting in December, Business usage will be a shared token allowance across ChatGPT and Codex, with credits for more.

The ChatGPT Enterprise figure is reported, not official. OpenAI publishes no Enterprise price, and the roughly $60 per seat number comes from procurement reports that OpenAI has never confirmed.

Which models power each one?

ChatGPT Business and Enterprise run OpenAI’s own models only. The current lineup includes GPT-6.1 Sol, GPT-6 Astra, GPT-6 Sol and Luna, and the GPT-5.6 family. Enterprise also gets a bigger context window for fast chat (128K tokens vs 54K on Business).

Copilot is now multi-model. Microsoft’s application card lists GPT models from Azure and from OpenAI, plus Claude Opus and Sonnet from Anthropic. GPT-6.1 Sol and Claude Sonnet 5.5 reached Word, Excel, PowerPoint and Chat on September 30, 2026. By default a router picks the model. Microsoft told investors that 90% of Copilot queries use that Auto mode.

So “ChatGPT has the better model” is no longer a simple win. Copilot often runs the same OpenAI models. The real difference is what each tool can see: Copilot sees your Microsoft 365 data, while ChatGPT sees what you connect or upload.

Features by job

The pattern is consistent. Copilot is strongest where the work already lives in Microsoft files, mail and meetings. ChatGPT is strongest when the work starts from a blank page, the open web, code, or tools outside Microsoft. It connects to Google Workspace, Slack, GitHub and Microsoft 365, with more than 2,000 plugins listed.

Agents: Copilot agents vs ChatGPT Work and Codex

Microsoft’s agent stack is deeper for IT. A licensed Copilot seat includes Researcher, Analyst and Facilitator, plus Sales, Service and Finance agents. Copilot Studio lets licensed users build internal agents at no extra cost, and it supports MCP and agent-to-agent (A2A) links. Agent 365, at $15 per user, adds a control plane to govern agents. The catch is cost: Cowork, Autopilot and premium models draw metered credits.

OpenAI’s agents are more hands-on for end users. ChatGPT Work takes a goal, plans, does the work and checks in for approval. Workspace agents, scheduled tasks, a built-in browser and Codex come with every Business seat. Premium seats add dots, which are always-on agents. For a platform-level view, see our AI agent platforms comparison.

Security, admin and compliance

Both vendors say they do not train on your business data by default. The differences are in the controls.

Microsoft 365 Copilot runs under enterprise data protection. Prompts and responses stay inside the Microsoft 365 service boundary. They follow your existing file permissions and are logged for eDiscovery and Purview. Copilot holds SOC 2, ISO 27001 and ISO 42001, and is covered by Microsoft’s HIPAA BAA. FedRAMP High is available through GCC High, though features vary there. One watch-out: Anthropic models sit outside the EU Data Boundary, so they are off by default for EU, EFTA and UK tenants.

ChatGPT Business includes SOC 2 Type 2, SSO and MFA, and no training on your data. However, ISO 27001-series certifications, SCIM, enterprise key management, role-based access, IP allowlisting, the Compliance API and data residency are Enterprise-only. Data residency covers 10 regions: US, EU, UK, Japan, Canada, Korea, Singapore, India, Australia and the UAE. Why regional hosting now matters is covered in our analysis of data sovereignty rules for AI. A HIPAA BAA is offered only on Enterprise with a Regulated Workspace, and ChatGPT holds FedRAMP Moderate.

The practical takeaway: Copilot gives you enterprise controls at the $21 tier because it inherits your Microsoft 365 setup. With ChatGPT, regulated firms usually have to go to Enterprise.

Cost for a 100-person team: a worked example

Assumptions (labeled):

1. The company already pays for Microsoft 365 Business Standard. That base cost is left out of every scenario.
2. All prices are list prices with annual billing, before tax or discounts.
3. In the mixed ChatGPT case, 15 of the 100 people need Premium seats.
4. In the “both” case, 20 power users get ChatGPT on top of Copilot.
5. Staff time is valued at $60 per hour, fully loaded (salary plus overhead).

Add about $2,400 a year if you run agents on one Copilot Studio credit pack (25,000 credits a month).

Does it pay back? At $60 an hour, a $21 Copilot Business seat pays for itself if it saves each user 21 minutes a month. A $20 ChatGPT seat needs 20 minutes, and a $100 Premium seat needs 100 minutes. The independent evidence below suggests most office users clear 21 minutes easily. But the gains go to people who actually use the tool, so license only those people.

What independent studies say about productivity

• UK government (20,000 civil servants): Copilot users reported saving an average of 26 minutes a day. This was self-reported.
• HMRC randomized trial (3,000 licenses): Users reported saving 2% to 3% of their week, or about 60 minutes. That is after HMRC cut its estimates by 20% for bias. Notably, 46% of non-users cited security worries.
• Harvard and BCG (758 consultants, GPT-4): Inside the AI’s “frontier,” consultants finished 12.2% more tasks, 25.1% faster, at higher quality. On a task outside it, they were 19% less likely to get it right.
• MIT, published in Science (453 professionals): Using ChatGPT cut writing time by 40% and raised quality by 18%.

The careful reading: savings are real but uneven. They are largest for drafting and summarizing. They are smaller in tightly controlled trials, and output still needs checking.

Adoption: who is buying what

Microsoft last disclosed 30 million-plus paid M365 Copilot seats in July 2026. On its October 28 earnings call, it gave no new seat count. It did say that customers with more than 50,000 Copilot seats grew eightfold year over year, and that E7 has “millions of paid seats.”

OpenAI says more than 5 million business users build with ChatGPT Business. Across all its products, it reaches more than 1 billion weekly users and 2.5 million businesses. The two companies count different things, so these figures don’t compare directly. For the wider OpenAI picture, see our OpenAI vs Anthropic enterprise comparison.

Which should you buy? A decision guide

• Buy Microsoft 365 Copilot if most work happens in Outlook, Teams, Word and Excel. Also choose it if you need HIPAA, FedRAMP or eDiscovery under one contract, or if IT wants a single admin console. Start with free Copilot Chat, then license Copilot Business ($21) for heavy Office users.
• Buy ChatGPT Business if you run on Google Workspace or a mixed stack, have developers who will use Codex, or care most about frontier model access. Fewer than 200 seats keeps you on self-serve pricing.
• Go to ChatGPT Enterprise if you need SCIM, data residency, a BAA or more than 200 seats. Budget for a quote, not a list price.
• Choose E7 ($99) only if you would buy E5, Copilot and Agent 365 anyway.

Microsoft also fits frontline companies that only need the occasional answer: free Copilot Chat may be enough. Comparing Microsoft against Apple’s on-device approach instead? See Copilot vs Apple Intelligence.

Can you use both?

Yes, and for many firms it is the cheapest good answer. A common pattern is free Copilot Chat or Copilot Business for everyone, plus ChatGPT Business seats for developers, analysts and writers. In our example that costs $30,000 a year, less than putting everyone on the $30 Copilot enterprise add-on. The costs of running both are governance (two data policies, two admin consoles) and overlap. Write an acceptable-use policy that says which tool handles customer data.

FAQ

Is Microsoft Copilot just ChatGPT inside Office?

No. Copilot uses OpenAI GPT models, but also Anthropic Claude, with a router choosing between them. More importantly, it works over your Microsoft 365 data with your existing permissions. ChatGPT only sees what you connect or upload.

Is Copilot Chat really free?

Yes, for users with an eligible Microsoft 365 work subscription. It includes web-grounded chat, Copilot in Outlook and enterprise data protection. Copilot in Word, Excel, PowerPoint and Teams needs a paid license.

Which is cheaper for a small business?

They are close. ChatGPT Business is $20 per seat (annual billing), and Copilot Business is $21, or $18 under the promo through December 31, 2026. Copilot also requires a Microsoft 365 Business plan, so ChatGPT is cheaper if you don’t already have one.

Is ChatGPT Business secure enough for regulated data?

For general business data, yes: it has SOC 2 Type 2, SSO, and no training on your data. For HIPAA, data residency or SCIM you need ChatGPT Enterprise, and HIPAA additionally requires a Regulated Workspace.