Guide · October 21, 2026 · 5 min read

ChatGPT vs. Claude vs. Gemini vs. Copilot: which should you use?

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If you're asking "which AI is best," you'll find a hundred rankings that disagree with each other. Here's the more useful question: which one fits the way you already work?

All four are capable general-purpose assistants. They can all draft emails, summarize documents, explain things, and brainstorm. The real differences come down to which apps they plug into, what the paid plans include, and what your employer allows.

One note on honesty before we start. We haven't run our own side-by-side quality tests, so this guide doesn't claim one writes "better" than another. Everything below comes from the vendors' own pricing and help pages, checked on October 21, 2026. Plans change often, so check the linked pages before you buy.

The quick answer

• You work in Microsoft 365 (Outlook, Word, Excel, Teams): start with Copilot.
• You work in Gmail and Google Docs: start with Gemini.
• You don't live in either, or want a standalone assistant: try ChatGPT or Claude free for a week each and keep the one you reach for.
• Your employer gives you one: use that one for work. Full stop.

Prices at a glance (US, as of October 2026)

Prices are from each vendor's official page (links in Sources) and don't include tax. One thing to know about the cheaper ChatGPT tiers: OpenAI's pricing page says the Go plan may include ads, and OpenAI has said Plus and higher stay ad-free.

ChatGPT

ChatGPT, from OpenAI, is the one most people have heard of, and it's the general-purpose default for a lot of users. Per OpenAI's pricing page, the free plan includes unlimited text chats (subject to abuse guardrails), web search, and file and image uploads, with limits on uploads, image creation, voice, and deep research.

Plus adds advanced reasoning models, higher limits, and features like projects, scheduled tasks, and custom GPTs. We cover that choice in detail in Free ChatGPT vs. ChatGPT Plus.

Good fit if: you want one standalone assistant for a bit of everything and don't need it built into Office or Google apps.

Claude

Claude, from Anthropic, is a standalone assistant like ChatGPT. Anthropic's pricing page lists a free plan that includes web search, file creation, memory across conversations, and up to five projects for organizing your work.

Pro adds more usage, full Projects (Free caps you at five), more Claude models, Claude in Chrome, and Claude for Microsoft 365 and Outlook. Anthropic also says plainly that Pro usage is at least five times Free's per five-hour window, and that every plan has usage limits.

One detail worth knowing: Anthropic's pricing page lists model training as "opt-out" on Free, Pro, and Max, and "none by default" on Team and Enterprise. So on a personal plan, you need to turn it off yourself. Issue #1 shows where.

Good fit if: you want a standalone assistant and are comfortable comparing it against ChatGPT for your own work.

Gemini

Gemini is Google's assistant. The free plan, per Google, includes image generation, Deep Research, Gemini Live (voice conversation), Canvas, and Gems (saved custom helpers).

The paid Google AI plans are bundled with Google One storage. AI Plus ($4.99/mo) adds Gemini in Gmail and 400 GB of storage. AI Pro ($19.99/mo) adds Gemini in Docs and Sheets, a much larger context window (how much text it can work with at once), and 5 TB of storage.

Watch out for one thing: Google says only personal Google accounts can buy these plans. If your work email runs on Google Workspace, your company has to add Gemini through Workspace instead.

Good fit if: your day lives in Gmail, Docs, and Drive, or you already pay for Google storage.

Copilot

Microsoft Copilot comes in two forms. There's a free Copilot app, which Microsoft describes as a limited version subject to capacity. Then there's Copilot inside Word, Excel, PowerPoint, and Outlook, which comes with Microsoft 365 subscriptions.

Microsoft 365 Personal ($9.99/mo) includes those desktop apps with Copilot and 1 TB of storage. Premium ($19.99/mo) raises the usage limits and adds features Microsoft lists as exclusive to Premium and Pro. On Family and Premium, Microsoft says the AI features are for the subscription owner only, not the people you share with.

Good fit if: you already pay for Microsoft 365 or spend your day in Outlook and Word.

Which should you pick?

My suggestion: don't buy anything yet. Use the free version of the one that matches your apps for a week, on real (scrubbed) tasks. Try our email prompts or the meeting-notes workflow in Issue #1. Upgrade only when you keep hitting a limit that actually slows you down.

And if you're choosing for a team, the paid business versions (ChatGPT Business, Claude Team, Gemini through Google Workspace, or Microsoft's business Copilot plans) matter more than the personal plans. They come with admin controls and different data terms. The Leaders track covers how to set that up.

What not to paste

Whichever you pick, the rule's the same: if you wouldn't email it to a stranger, don't paste it into a personal AI account. No customer details, health information, passwords, account numbers, or anything confidential. Turn off training in your settings (see Issue #1), and use your employer's approved tool for work.

Try this

Pick one task you do every week. Run it through the free version of two of these tools with the same prompt, and keep whichever answer you'd actually send. That's a better test than any ranking, including ours.

Sources

All checked October 21, 2026. Prices are US and exclude tax.

• OpenAI, ChatGPT plans and pricing and What is ChatGPT Plus?
• OpenAI, Introducing ChatGPT Go (Go's US price; Plus and higher remain ad-free)
• Anthropic, Claude pricing
• Google, Gemini subscriptions and Google AI plans on Google One
• Microsoft, Copilot pricing plans for individuals and Compare Microsoft 365 plans (Premium price)