Creating a Custom GPT—With ChatGPT’s No-Code Builder

How to Configure a Personalized Assistant Without Coding or Complex AI Training

What is a GPT in this context?

A GPT here is a custom version of ChatGPT that you configure with your own written rules, example prompts, and optional reference files.

You are not training a new AI brain; you are simply giving the existing model a clear job description and style guide so it responds the way you need.

The no-code GPT Builder lets you set up a private assistant without writing code.

It works on top of OpenAI’s existing model, so you only give it written rules instead of training new AI from scratch. The core brain stays the same; you’re just telling it how to talk and what to focus on.

You find the tool inside ChatGPT under “Explore GPTs.”

Then click “Create a GPT,” give it a clear name and a short description, and note the kind of questions it should answer. These basics define the assistant’s job.

You shape the assistant by writing rules and adding examples or files.

Type instructions about tone, depth, and off-limits topics. Paste sample questions and answers to show the style you want. If you need it to reference specific content, upload documents like PDFs or spreadsheets so it can pull facts from them.

FOR EXAMPLE...

Let's say we are creating a simple Customer Support GPT for a software company.

Here's the prompt we'll use:

• Tone: Use a professional but friendly tone.

• Depth: Provide short, direct answers for common issues. Offer detailed explanations only if the user asks for more.

• Off-Limits Topics: Do not answer questions about future product releases or company financial data. If asked, respond with: “I’m not authorized to share that information.”

And of course, give an instruction text example:

"You are a customer support assistant for SoftTools Inc. Your main job is to help customers troubleshoot software issues and explain product features clearly. Stay polite and avoid technical jargon unless the user requests advanced details. Do not speculate about future product updates or financial information."

Add Example Prompts (to show the desired style)

Example User Prompt: "How do I reset my password?"

Example Assistant Answer: "To reset your password, go to the login page and click on ‘Forgot Password.’ Follow the instructions sent to your email. Let me know if you need further help."

Example User Prompt: "Will there be a new version of the app soon?"

Example Assistant Answer: "I’m not authorized to share information about upcoming releases. Please check our official website for updates."

Then, possibly, upload Reference Files (for accurate answers)

• Upload the official user manual PDF;

• And/or upload a spreadsheet with the latest product troubleshooting steps.

This way, when users ask specific questions like “What are the system requirements for the latest version?”, the GPT can pull accurate details directly from the uploaded documents.

With this setup, the GPT will act professionally, stay within its role, avoid restricted topics, and provide correct information based on real company documents.

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Should instructions be placed in other sections of the platform?

No, the main rules and behavior settings for your GPT must be written only in the Instructions field. This is where the model looks to understand how it should behave. The other fields have different purposes and should not be used to store behavior rules.

Here’s how to correctly use each section...

✦ Instructions (Main Rules): This is where you tell the GPT exactly how to behave. Example: “You are a customer support assistant. Answer politely, avoid technical jargon unless requested, and don’t discuss future product updates.”

✦ Name and Description: These are just labels that users see when browsing or opening your GPT. They don’t affect how the GPT behaves. Example Name: “SoftTools Support Bot” Example Description: “Helps users troubleshoot common software issues quickly.”

✦ Conversation Starters: These are just example questions the user might ask. They help start the conversation but don’t control how the GPT responds. Example: “How do I reset my password?” or “Show me how to update the app.”

✦ Knowledge/Files: upload files here if you want the GPT to refer to specific content like manuals, guidelines, or product information. This adds useful facts but doesn’t change how the GPT behaves.

In simple terms:

• Put all behavior instructions and tone settings in the Instructions field.

• Use Name and Description to help people understand what your GPT is for.

• Add Conversation Starters to suggest example questions.

• Upload files in the Knowledge section only if the GPT needs to refer to specific documents.

If you try to put behavior rules anywhere other than the Instructions field, they will be ignored by the model. Always keep important guidelines in the right place.

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ALSO...

A live preview shows answers so you can adjust quickly.

Ask trial questions in the preview pane, read the replies, and tweak your instructions until the results sound right. This back-and-forth is how you catch errors or missing details early.

When ready, you deploy with a share link or pin it for your own use.

Copy the link to give colleagues access, or keep the GPT in your sidebar for everyday tasks. Usage counts against the same ChatGPT plan you already pay for.

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Remember, this builder changes prompts, not the core model.

It is a fast way to customize responses, but the assistant still inherits the main model’s knowledge cut-off, biases, and possible mistakes. You’ll need to review its answers regularly and update the rules when requirements change.