There is no single best AI assistant for every small business. The right pick depends on the tasks you want to hand off, the data that will pass through the tool and the apps your team already uses. The safest way to decide is a one-week test of two or three assistants on the same real tasks, and only then a look at the price per seat. This guide does not pick a winner: the same criteria apply to ChatGPT (OpenAI), Claude (Anthropic), Copilot (Microsoft) and Gemini (Google), listed alphabetically.
Criteria for comparing AI assistants
Use the table as a checklist and answer it once for each assistant, before you read any ad.
| Criterion | What to ask |
|---|---|
| Tasks | Writing, customer replies, spreadsheets and formulas, document summaries, images: which do you do every week? Is image generation in the plan you would pay for? |
| Privacy and training | Do conversations train the model? Do the rules differ between personal and business plans? How long is history kept, and who administers it? |
| Integrations | Does it work inside Gmail, Docs and Sheets, or Word, Excel and Outlook, or only in a separate window? Who has to approve it? |
| Language quality | Does it match your brand voice in American English and get names, amounts and dates right? |
| Cost per seat | Is it priced per user per month or per year? Is there a minimum number of seats? Is it bundled in a suite you already pay for? What are the usage limits? |
| Team controls | Can you create work accounts, require two-step verification and remove access when someone leaves? |
We left prices out on purpose because they change often. Open each vendor's official pricing page on the day you decide, and count only the people who will really use the tool.
Personal plans and business plans follow different rules
The same company can handle your data one way in a personal account and another way in a work plan, and for customer data that is the criterion that matters most. The summary below comes from each vendor's official pages, with the same points for all four.
| Assistant | Work plans | Personal accounts |
|---|---|---|
| ChatGPT (OpenAI) | Enterprise, Business, Edu and the API: OpenAI says it does not train on your organization's data by default. | The privacy policy says content may be used to improve the services, with a control for the user to choose. |
| Claude (Anthropic) | Team, Enterprise and the API: Anthropic says it will not use your chats to train its models, unless you join its Development Partner Program or explicitly submit material. | Free, Pro and Max: there is a "Help improve our AI models" setting; turning it off applies to new conversations. |
| Copilot (Microsoft) | Work or school account: prompts, responses and Microsoft Graph data are not used to train foundation models. Web searches follow separate rules. | Personal Copilot: a "Training on conversation activity" setting lets you opt out. |
| Gemini (Google) | Workspace: prompts are customer data, and Google says it does not train models on them without prior permission. | Personal account: a subset of chats is reviewed by people; the control is "Keep Activity," and Google asks you not to enter confidential information. |
These terms change and differ by plan: check the official page on the day you buy and the setting inside the account. Not training is not the same as not storing, so ask about retention and who at your company can see the history.
Integrations: where your team already works
If your team lives in Google Workspace or Microsoft 365, test the assistant inside those apps. According to the official pages: Gemini works in Gmail, Docs, Sheets, Meet and Drive, and Workspace Business and Enterprise plans include Gemini features, depending on the edition. Microsoft 365 Copilot works in Word, Excel, PowerPoint, Teams and Outlook within each user's permissions; Copilot Chat comes with eligible licenses, and the full experience in the apps requires an add-on license. Claude has connectors for Gmail, Google Calendar and Drive and, with an administrator, for SharePoint, OneDrive, Outlook and Teams. OpenAI's help center lists apps connected to ChatGPT, such as Google Workspace (with an administrator-managed setup), Microsoft Teams and Outlook.
A one-week test on the same tasks
Give every assistant the same request, using fake or anonymized data. One person logs everything in a spreadsheet, scoring 1 to 5 for quality, editing time and errors found.
- Day 1, setup. Create test accounts, check each one's training setting and write down five real tasks from your business.
- Day 2, writing. Ask for a product description, a customer email and a social post in your brand voice. Note the minutes of editing each one needs.
- Day 3, customer replies. Use three real messages with no names, phone numbers or order details. Check whether the AI invents a deadline, policy or price you did not give it.
- Day 4, spreadsheets. Use a fake sales sheet, similar to a simple inventory spreadsheet. Ask for a summary, a formula and a chart, then check the math by hand.
- Day 5, images and documents. Send the same image brief to each one or, if you do not use images, ask for a summary of the same long text with no confidential data.
- Day 6, integration. Repeat one task inside the tools you already use. Count the clicks and what your administrator had to enable.
- Day 7, decision. Add up the scores, price only the people who would really use it and choose: stay, switch or keep two. A colleague can rate the texts without knowing which assistant wrote each one.
When switching is worth it, and when it is not
Switching is worth it when
- your current assistant repeatedly fails on your real tasks (wrong tone, wrong math, invented answers);
- you use a personal account for work data and another vendor has a business plan with data terms that meet your needs;
- your team uses Google Workspace or Microsoft 365 and the built-in option removes copy and paste at a cost that fits;
- you pay for seats nobody uses, or a suite you already pay for covers almost everything;
- your test showed measured time savings, not just an impression.
Switching is not worth it when
- the reason is a launch headline or a benchmark ranking: public tests do not use your tasks;
- only one or two answers looked better;
- the cost of moving (saved prompts, team training, an annual plan) outweighs the gain;
- your data rules stay the same, for example you are still on a personal account.
Rule of thumb: switch only if the new assistant beats the current one on at least two of your three main tasks and passes your data check. For simple jobs, look first at free AI tools for small business.
What never to paste into an AI
- Customer personal data: a name with a phone number or email, home address, Social Security number, order history tied to a person, unredacted chat or email threads.
- Sensitive data: health, biometrics, religion, political views, union membership.
- Payment and access: card numbers, bank details, passwords, API keys, one-time codes.
- Business secrets: contracts under NDA, unreleased pricing, financial statements, source code.
- Employee data: payroll, performance reviews, medical leave.
OWASP, which catalogs risks in AI applications, lists personal, financial and health data, confidential business data, credentials and legal documents among the information that can leak. In the US, the FTC says "there is no AI exemption from the laws on the books" and warns AI companies that failing to honor privacy commitments, including promises not to use customer data to train models, can create liability. The same logic applies to your own promises: if your privacy policy or checkout page tells customers how you use their data, your team's AI use should match it. The FTC's guide for businesses adds simple habits: keep only what you need, avoid keeping customers' card details unless essential, and use Social Security numbers only for required, lawful purposes. State privacy laws and industry rules for health or finance may add duties, so ask a lawyer about your case.
How to use AI without exposing the data
- Swap names for labels such as "Customer A" and remove details that identify a person when combined, like city, date and product.
- Use a work account with data terms and training turned off, never an employee's personal account.
- Protect the account with two-step verification, because a hijacked account exposes the chat history. See what to do if your email is hacked and the risks of AI for businesses.
Sources: official privacy pages from OpenAI, Anthropic, Google and Microsoft, the FTC, OWASP and NIST. Terms, plans and prices change often: check each vendor's official page before you decide.
Frequently asked questions
What is the best AI assistant for a small business?
None wins at everything. The best one for you gets your tasks right, fits your data rules and works in the tools your team already uses. Find out with a one-week test of two or three assistants on the same tasks.
Does the AI train on what I type?
It depends on the vendor and the plan. On their official pages, OpenAI, Anthropic, Google and Microsoft say the work plans cited here do not train on your data by default, with the exceptions each describes. Personal accounts have their own settings, so check the page and your account.
Can I use the free version for my business?
For tasks with no customer data or secrets, such as drafting ideas, yes. For customer data, choose a work plan with data-protection terms and anonymize what you can. The FTC says there is no AI exemption from the law.
Do I need to switch every time a new model comes out?
No. Switch when your own test, on your own tasks, shows a clear gain and your data rules are still met. A launch headline or a ranking is not a substitute for the test.
Sources: OpenAI: Business data privacy, security, and compliance · OpenAI: Privacy policy (EEA, UK and Switzerland version) · Anthropic: How do you use personal data in model training? (commercial products) · Anthropic: How do I change my model improvement privacy settings? · Microsoft Learn: Enterprise data protection in Microsoft 365 Copilot and Copilot Chat · Microsoft Support: Microsoft Copilot privacy controls · Microsoft Learn: What is Microsoft 365 Copilot? · Google Workspace Help: Generative AI in Google Workspace Privacy Hub · Google Workspace Help: Google Workspace with Gemini · Gemini Apps Help: Gemini Apps Privacy Hub · Claude Help Center: Use Google Workspace connectors · Claude Help Center: Set up the Microsoft 365 connector · OpenAI Help Center: Connected apps · FTC Office of Technology: AI Companies: Uphold Your Privacy and Confidentiality Commitments · FTC: Protecting Personal Information: A Guide for Business · OWASP Gen AI Security Project: LLM02:2025 Sensitive Information Disclosure · NIST: Generative AI Profile (NIST AI 600-1)
