How to Set Up a Custom GPT in ChatGPT for Tasks You Repeat Weekly

Open the GPT builder

In your browser, go to chatgpt.com and sign in. Look along the left sidebar for an item labeled Explore GPTs and click it. A new page opens showing featured GPTs, and somewhere near the top right you'll see a button labeled + Create or My GPTs — click that. A two-panel screen opens: a Configure tab on the left and a Create tab on the right. The Create tab is a chat where you describe what you want in plain English; the Configure tab is a form with named fields. Either path leads to the same GPT.

If your sidebar looks different, try clicking your account name or the ⋯ menu at the top of the chat list — the GPT builder is sometimes tucked in there on mobile. The screen you're aiming for has headings like "Name", "Description" and "Instructions".

Next step ↓

Name your GPT and describe what it does

On the Configure tab, click into the Name field at the top and write a short, clear name. Then click into the Description field below it and write one or two sentences explaining what the GPT is for. These two fields are how you'll recognize this GPT later — both in your own sidebar and in any list you share.

If you're on the Create tab instead, just type the name and description into the chat as if you're asking the builder to set it up for you. The builder will fill in the same fields on the Configure tab, which you can then edit.

Description: Turns my rough end-of-week notes into a clean status report in our standard format.

Next step ↓

Write the instructions

Scroll down to the large box labeled Instructions and write a paragraph that tells the GPT how to behave every single time. This is the heart of the setup — think of it as the rules of the house. The more specific you are, the more consistent the answers will be. Include the tone you want, the format you expect, and any rules it must never break.

If the Instructions box feels hard to fill, switch to the Create tab and describe your task in a sentence or two — the builder will draft instructions for you, which you can then tweak on the Configure tab.

Next step ↓

Upload your reference files (optional but useful)

Still on the Configure tab, scroll to a section called Knowledge. Click the Upload files button and pick one or two documents the GPT should always have access to — a style guide, a report template, a list of approved phrases, a glossary. The GPT will read these on every conversation, so it's like handing it a small notebook of your preferences.

Start small. Two or three short files beat ten long ones, because the GPT can only "remember" so much at once (the technical term is the context window — think of it as the desk space on the AI's desk, and every file takes up some of it). You can always add more later.

Next step ↓

Add a few conversation starters

Scroll to Conversation Starters. These are the clickable prompt buttons a user sees when they first open your GPT — a kind of quick-start menu. Add three or four short prompts that match how you'll actually use it. The first time you open the GPT, you'll probably click one of these instead of typing from scratch.

If the section is hidden, look for Suggested prompts or a small ✨ icon. On the Create tab, you can also type "add three conversation starters" and the builder will fill them in for you.

Next step ↓

Save and try it out

At the top right of the Configure tab, click Save (or Update if you're editing an existing GPT). A small panel asks who can use it — pick Only me for a personal weekly helper, Anyone with a link to share with a teammate, or Public to put it in the GPT store. Click Confirm, then open your GPT from the sidebar.

Send your first real test message. Don't be surprised if the first answer needs a tiny tweak — that's normal. Edit your instructions, save again, and try once more. After two or three rounds the GPT usually settles into a rhythm that needs almost no correction. One honest limit: a Custom GPT cannot log into your email, calendar, or company database, so you'll still paste the data it needs into the chat yourself.