A comparison for businesses

Claude vs ChatGPT vs Copilot: which one should your company choose?

Claude vs ChatGPT vs Copilot: in a business, there is no single winner. Claude is our starting point for long documents, writing and code; ChatGPT for versatility and its ecosystem; Copilot if your teams live in Microsoft 365. Many companies combine two of them. Kailli sells none of these tools.

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In brief

Who it's for
executives and managers equipping their teams with AI.
What we compare
business plans, pricing, data, administration, uses by task.
Sources
official pages from Anthropic, OpenAI and Microsoft, read on October 11, 2026.
Independence
no tools sold, no affiliate links.

01The table

The Claude, ChatGPT and Copilot comparison table

All three have a business plan that does not train models on your data by default. They differ in integration, agents and administration.

CriterionClaudeChatGPTCopilot
VendorAnthropicOpenAIMicrosoft
Business plansTeam (2 to 150 people), EnterpriseBusiness (formerly Team, from 2 seats), EnterpriseCopilot Chat, Microsoft 365 Copilot
List priceTeam: $20/seat/month billed annually, $25 billed monthlyBusiness: $20/seat/month billed annually, $25 billed monthlyCopilot Chat included in eligible Microsoft 365 licenses; Copilot Business: €15.60 excl. VAT/month billed annually (advertised offer, €18.20 otherwise)
ModelsOpus, Sonnet, HaikuOpenAI's GPT modelsOpenAI models, and Claude if the admin enables it
Integrationconnectors, MCP, Claude for Microsoft 365Google Workspace, Slack, GitHub, Microsoft 365 connectorsWord, Excel, PowerPoint, Outlook, Teams
AgentsClaude Code, Coworkworkspace agents, CodexResearcher, Analyst, Copilot Studio
Datano training by default (Team, Enterprise)no training by default (Business, Enterprise)prompts and Microsoft 365 data not used for training
AdministrationSSO, centralized billing; Enterprise: SCIM, audit logsSAML SSO, MFA, centralized billingMicrosoft 365 admin center

List prices excluding tax and features checked on October 11, 2026 on the official pages of Anthropic, OpenAI and Microsoft. Enterprise plans are negotiated.

02By task

Task by task: which tool should you choose?

Here is our starting point for each task, to be confirmed on your own files. This is not a benchmark ranking.

Long documents

Claude. Depending on the model, it accepts up to a million tokens of context: an entire contract or report fits in a single request.

Business writing

Claude or ChatGPT. Quality depends mostly on your document templates and instructions, stored in a shared Project or GPT.

Spreadsheets and data

Copilot if your files live in Excel and SharePoint. Otherwise Claude or ChatGPT, which run code to analyze a file.

Meetings and email

Copilot, if it's already in Outlook and Teams: it reads your emails, meetings and files with no copy-pasting.

Web research

All three can search the web. Always open the source page before reusing a figure.

Code

Claude Code or Codex, included in Team and Business seats. To choose the editor, read Cursor vs Claude Code for developers.

Agents and automation

Claude Cowork, ChatGPT's workspace agents or Copilot Studio. The right choice follows where your data lives.

Already chosen? We'll tell you how it holds up in your context.

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03Head-to-head 1

Claude vs ChatGPT: what sets them apart

Claude and ChatGPT list the same price for a team. The difference lies in how they're used: Claude for long documents and code, ChatGPT for the breadth of its ecosystem.

Claude's strengths

Long context, shared Projects, Claude Code and Cowork in the Team seat, MCP connectors. Our page explains how to deploy Claude in your company.

ChatGPT's strengths

GPTs, Projects, Deep Research, ChatGPT agent and Codex in the Business seat, with connectors to the most common tools.

Cost

$20 per seat per month billed annually for both, and a Premium seat at $100. Claude Enterprise adds usage at API rates; ChatGPT Enterprise is quote-based.

04Head-to-head 2

ChatGPT vs Copilot: same models, two approaches

Microsoft 365 Copilot runs on OpenAI models. The real difference lies elsewhere: Copilot works inside Microsoft 365, with your data and your access rights; ChatGPT is a separate space that you connect to your tools.

Your teams spend the day in Outlook, Teams and Excel? Copilot saves the copy-pasting. They also use Google Workspace or Slack? ChatGPT covers more ground.

05Head-to-head 3

Claude vs Copilot: specialist or office suite

Claude vs Copilot is no longer quite a head-to-head: Microsoft offers Claude models in Copilot, and Anthropic offers Claude for Microsoft 365.

In Europe, Anthropic models in Copilot are disabled by default and excluded from Microsoft's EU Data Boundary. Turning them on is a decision for your IT department, not a simple setting.

06Data

Data and privacy: what really changes

On their business plans, Anthropic, OpenAI and Microsoft do not train their models on your data by default. The real risk lies elsewhere: personal accounts used for work, and sensitive data sent with no rules.

  • Individual accounts: training can be turned off, but one person at a time.
  • Contract: OpenAI signs a data processing agreement (DPA) for Business and Enterprise; ask every vendor for the same document.
  • Rule: decide which data goes into which tool, and write it into an AI usage policy.

For the legal framework, see ChatGPT, Claude and GDPR.

This content does not constitute legal advice.

07One or several

Should you pick just one AI tool?

Not necessarily. The right model depends on the task, not the brand: often, you keep the tool already installed and add the right model for two or three specific tasks.

Before recommending a change, we look at what your teams actually do, what a second license costs, and whether the gap on your own files is significant. If not, we work with your tools. It's an independent view of your tools: Kailli sells no tools.

How this comparison is made

Product facts taken from the three vendors' official pages on October 11, 2026, updated when a plan changes. No affiliation, no sponsored links. The per-task verdicts are a starting point: we confirm them on your files.

Written by Rémi Carbonnefounder and CTO of Kailli

Frequently asked questions: Claude, ChatGPT or Copilot.

Why choose Claude over ChatGPT?

For long documents, demanding writing and code, Claude is often our first choice. ChatGPT remains broader in integrations and features. The best test is still two weeks on your own files.

Which AI is better than ChatGPT?

None, across every task. Claude, Copilot, Gemini or Mistral Le Chat do better for some uses and worse for others. Choose by task, not by brand.

Is Copilot a good tool for a business?

Yes, if the company works in Microsoft 365: Copilot uses your emails, meetings and files while respecting existing access rights. Outside Microsoft 365, its value drops sharply.

What AI is behind Copilot?

Microsoft 365 Copilot runs on OpenAI models. Since September 2025, Microsoft also offers Anthropic's Claude models, which the admin can enable or not. In Europe, they are disabled by default.

Claude or ChatGPT: which is safer for data?

On their business plans, neither Anthropic nor OpenAI trains its models on your data by default, and the retention period can be configured on Enterprise. Security depends mostly on your rules: which data goes into which tool, and who has access.

Can you use Claude and ChatGPT at the same time?

Yes, and it's common, for example Copilot for office work and Claude for long documents. You then need a written rule per tool, and you shouldn't pay for two licenses for people who only use one.

Which one is cheapest for a team?

As of October 11, 2026, Claude Team and ChatGPT Business list $20 per seat per month billed annually. Copilot Chat is included in eligible Microsoft 365 licenses; Microsoft 365 Copilot Business is listed at €15.60 excl. VAT billed annually. Check the official pages before buying.

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