ChatGPT vs Claude vs Copilot: Which One for Your Business?

Why This Comparison Exists

Every client we work with asks the same question: which AI tool should we use? The internet is full of benchmark comparisons that measure performance on academic tests, coding challenges, and reasoning puzzles. Those benchmarks tell you very little about how a tool performs on the tasks your business actually needs: drafting professional emails, analysing spreadsheet data, reviewing contracts, and generating internal reports.

This comparison is based on our experience deploying all three platforms across client engagements. We evaluate them on the tasks that matter to SMEs, not on their ability to solve logic puzzles.

The Three Platforms at a Glance

ChatGPT (OpenAI): The most widely known AI assistant. Available through a web interface, mobile apps, and an API. Offers a free tier and paid plans (Plus and Team). Strong general purpose capabilities with a large plugin ecosystem and integration with third party tools.

Claude (Anthropic): Known for careful, nuanced responses and strong performance on long document analysis. Available through a web interface and API. Offers free and paid tiers (Pro and Team). Particularly strong at following detailed instructions and maintaining consistency across long outputs.

Microsoft Copilot: Integrated into the Microsoft 365 ecosystem (Word, Excel, Outlook, Teams). Requires a Microsoft 365 subscription plus a Copilot add on. Its primary advantage is native integration with tools your team already uses daily.

Task by Task Comparison

Email Drafting and Professional Communication

All three platforms handle basic email drafting competently. The differences emerge in nuance, tone control, and consistency.

ChatGPT produces natural, conversational drafts quickly. It occasionally defaults to an overly casual tone for business communication, but responds well to explicit tone instructions. It excels at generating multiple variations of the same message.

Claude tends to produce more measured, precise language out of the box. For professional services firms, legal communications, and client facing correspondence, Claude's default tone often requires less editing. It is particularly good at maintaining a consistent voice across a series of related communications.

Copilot's advantage is context. Because it lives inside Outlook, it can reference previous email threads, meeting notes, and attachments when drafting responses. For teams deeply embedded in Microsoft 365, this contextual awareness saves significant time. The trade off is that its standalone writing quality is generally a step behind ChatGPT and Claude.

Data Analysis and Spreadsheet Work

This is where the differences become pronounced.

ChatGPT handles data analysis through its Code Interpreter feature, which can process uploaded files, run Python code, and generate charts. It is effective for ad hoc analysis: upload a CSV, ask a question, get an answer with a visualization. The limitation is that complex multi step analyses sometimes require careful prompting to stay on track.

Claude is strong at explaining data patterns and generating analysis frameworks, but its file processing capabilities are more limited. Where Claude excels is in interpreting results and writing narrative commentary around data. If you need variance analysis commentary or board report summaries, Claude produces polished output.

Copilot in Excel is the most practical option for teams that work primarily in spreadsheets. It can create formulas, build pivot tables, and generate charts without leaving the application. The accuracy of its formula suggestions has improved significantly, though complex financial models still require careful verification. For day to day spreadsheet tasks, the workflow integration is hard to beat.

Document Review and Summarisation

Document review is one of the highest value AI applications for professional services firms, and this is where Claude has a notable advantage.

Claude can process very long documents (up to 200,000 tokens in its current configuration) and maintain context throughout. This makes it effective for reviewing contracts, analysing lengthy reports, and extracting specific information from large document sets. Its attention to detail on nuanced language, such as contractual obligations and conditional clauses, is consistently strong.

ChatGPT handles document review well for shorter documents. Its file upload feature supports PDFs and other common formats. For documents under 50 pages, performance is comparable to Claude. For very long documents or multiple related documents, context management becomes more challenging.

Copilot integrates with Word and can summarise, restructure, and review documents within the application. For teams that work primarily in Word, the in application experience is seamless. However, its ability to handle complex analytical review (identifying inconsistencies, comparing clauses across documents) lags behind both Claude and ChatGPT.

Code Generation and Technical Tasks

For businesses with development teams or technical automation needs, code generation quality matters.

ChatGPT and Claude both produce high quality code for common languages and frameworks. ChatGPT has a slight edge in popular languages like Python and JavaScript due to its larger user base and feedback loop. Claude tends to produce better documented code with clearer explanations, which is valuable for teams where non developers need to understand what the code does.

Copilot (specifically GitHub Copilot, which is separate from Microsoft 365 Copilot) is the leading tool for in editor code completion. It integrates directly into development environments and suggests code as you type. For dedicated development teams, GitHub Copilot is generally the preferred choice for day to day coding productivity.

Pricing Considerations

ChatGPT Plus costs approximately USD 20 per user per month. The Team plan costs USD 25 to 30 per user per month with additional admin controls and longer context windows.

Claude Pro costs approximately USD 20 per user per month. The Team plan costs USD 25 to 30 per user per month with workspace features and higher usage limits.

Microsoft 365 Copilot costs approximately USD 30 per user per month on top of your existing Microsoft 365 subscription. This makes it the most expensive option, but the integration value may justify the premium for heavy Microsoft 365 users.

For most SMEs, we recommend starting with one platform and expanding based on specific needs rather than subscribing to all three simultaneously.

Our Recommendation

If your team lives in Microsoft 365 and your primary needs are email, spreadsheets, and document editing, start with Copilot. The integration eliminates friction and the learning curve is minimal.

If you need strong document analysis and professional writing, start with Claude. Its performance on long documents, careful attention to instruction following, and measured tone make it well suited for professional services, finance, and advisory work.

If you need versatility and the broadest feature set, start with ChatGPT. Its plugin ecosystem, code interpreter, and large community of users sharing prompts and techniques make it the most flexible general purpose option.

In practice, many of our clients end up using two platforms: one for day to day productivity (usually Copilot or ChatGPT) and one for specialized analysis and document work (usually Claude). The cost of two subscriptions is modest compared to the productivity gains.