The short answer
ChatGPT earns its keep in a small business on writing and reading: replying to customer emails, turning rough notes into something clean, summarizing long documents, and drafting the policies, job posts and FAQs nobody gets around to. It is weak at anything that depends on facts it doesn't have, like your prices, your stock or your schedule, unless you give them to it.
The setup below works the same way in Claude, Gemini or Copilot. If you're not sure which to pay for, see which AI tool to pay for.
What it costs
| Plan | Price | Who it fits |
|---|---|---|
| ChatGPT Free | $0 | Trying the prompts below. Uploads and memory are limited. |
| ChatGPT Plus | $20/month, billed monthly | One person using it daily. Includes Projects and scheduled tasks. OpenAI doesn't offer annual billing for Plus. |
| ChatGPT Business | $25/user/month, or $20 billed annually | Two or more people (2-user minimum). Shared projects, admin controls, and no training on your business data by default. |
Start one person on Free or Plus. Move to Business when a second person needs it, or before customer data goes in.
Step 1: Pick three tasks you repeat every week
Write down the three things you or your staff type most often. Good candidates in almost any business:
- Replies to the same handful of customer questions
- Turning call or meeting notes into a summary and next steps
- Quotes, proposals or letters that reuse the same wording
- Review replies, job posts and social posts
- Reading a long document, such as a lease, a vendor contract or a policy, and pulling out what matters
For example, a dental office might pick reminder wording, insurance FAQ replies and new-patient letters. A bookkeeping firm might pick client request summaries, engagement letter drafts and month-end checklists. A shop might pick product descriptions, return-policy replies and supplier emails.
Step 2: Give it your rules once
Create a Project (ChatGPT and Claude both have them): a folder with standing instructions and files that every chat inside it can see. Add your price list or service menu, your policies, two or three emails you were happy with, and instructions like these:
You help me run [business name], a [type of business] with [number] staff. Rules: - Write like the attached example emails: short, friendly, plain English. - Never invent prices, dates, availability or policies. If something is missing, write [CHECK] and ask me. - Use only the attached price list and policies for facts about the business. - Keep customer replies under 120 words unless I ask for more. - When I paste notes, return a summary, the decisions made, and next steps with who owns each one.
Step 3: Five starter prompts
A customer wrote this: [paste]. Draft a reply using our policies. If the answer depends on something that isn't in our files, tell me what I need to check.
Here are my rough notes from a call with [customer]: [paste]. Turn them into a short summary, the decisions, and a next-steps list I can send them.
Attached is [a lease / a vendor contract / a policy]. List the dates, costs, renewal terms and anything that would surprise a small business owner. Quote the section for each point.
Write a reply to this review: [paste]. Thank them, address their specific point, and don't admit fault or promise anything I haven't approved.
Using the attached example, draft a [quote / welcome letter / checklist] for [details]. Mark anything you had to guess with [CHECK].
The data rules
- Check the training setting. On personal plans you can turn off model training in settings. ChatGPT Business doesn't train on business data by default.
- Keep regulated data out unless your plan and your obligations allow it. Health, legal and financial records come with rules; check what applies to you before pasting client details.
- A person sends it. AI drafts. Someone who knows the customer reads it before it goes out.
A one-week way to try it
- Set up the Project above on a free plan.
- Use it for your three tasks every time they come up this week.
- Note roughly how long each one took compared with usual.
- If it saved real time, pay for one seat. If not, you've lost a few evenings, not a subscription.
Sources
Prices are list prices in US dollars from each vendor's own page, checked October 21, 2026. Vendors change prices and plans often, so confirm on their page before you buy. I don't get referral fees from any tool mentioned here.