How to Build Your Custom GPT in 5 Simple Steps with GPT Builder

Artificial Intelligence - Last Updated on November 21, 2023 by Jussi Hyvarinen

Unleash Your Inner AI: How to Build Your Custom GPT

Jussi Hyvärinen

I'm Jussi, with over 25 years of expertise, I help entrepreneurs navigate the online business world. My services include tailored recommendations, step-by-step tutorials, and insightful reviews to help steer your business aspirations. Please reach out if you need assistance with your online business plans or have any questions.

A custom GPT is a customized version of ChatGPT that is tailored for a specific purpose or dataset using OpenAI's conversational AI technology.

The recent release of ChatGPT has sparked a conversational AI revolution. Now, with the introduction of custom ChatGPT, also known as GPTs, anyone can create their own personal or business assistant tailored to their unique needs. 

In this guide, we'll explore what GPTs are, the benefits of creating your own, and provide a step-by-step tutorial on building your own GPT from scratch.

What Are GPTs?

GPTs are custom AI chatbots built using ChatGPT's natural language processing technology. The "GPT" stands for Generative Pretrained Transformer, the machine learning model developed by OpenAI that powers ChatGPT.

With GPTs, you can create your own tailored variant of ChatGPT designed for a particular purpose, persona, or dataset. The capabilities of your specialized assistant are limited only by your imagination and training capabilities.

Here are some examples of possible custom GPT use cases:

  • A financial advisor GPT trained on a firm's offerings & client portfolio history
  • A car mechanic GPT knowledgeable about make/model repair procedures
  • A gaming GPT that roleplays unique characters and storylines
  • A sales GPT equipped with your catalog & CRM data
  • A nutritionist GPT personalized to an individual's health needs

Benefits of Building Your Own GPT

Here are some of the key benefits of creating a custom ChatGPT or GPT:

  • Specificity - Tailor your GPT's knowledge and capabilities to your particular needs. For example, an accountant could build a GPT versed in tax codes.
  • Privacy - Keep sensitive information private by only sharing your custom GPT with selected people.
  • Control - Shape your GPT's tone, personality, and limitations.
  • Cost savings - Access the power of AI without expensive custom development. 
  • Lead generation - Drive traffic to your website by sharing your GPT publicly.
  • Revenue - If published in OpenAI's upcoming GPT Store, popular GPTs can earn their creators passive income.

How to Build Your Own GPT in 5 Steps

Ready to be your own AI assistant engineer? Here's a step-by-step guide to creating a custom ChatGPT tailored to your needs:

Step 1: Describe Your GPT's Purpose

Log into your ChatGPT account and navigate the "Explore" section. Click on "Create a GPT" to open the builder. Note that you need to have a paid ChatGPT Plus subscription to access this feature.

Custom GPT image1

In the message box, describe what you want your GPT's role to be in a sentence or two. Make it as specific as possible. For example:

"I want to create a GPT that gives yoga advice for beginners." 

After you submit your prompt, the GPT builder will suggest a name and profile image based on your description.

Step 2: Provide Setup Instructions

Custom GPT image2

Next, the builder will ask several follow-up questions to define further how your GPT should behave:

  • What tone of voice or personality should the GPT have? (Expert, casual, funny, etc.)
  • Should it use technical jargon or plain language? 
  • What topics/actions should the GPT avoid or refuse to engage with?
  • If a user's question is unclear, should it ask for clarification or try to provide its best guess?
  • Should responses be concise factoids or detailed explanations?

Answer these initial questions with as much guidance as possible. Your responses here will form the foundation of your GPT's "training."

Step 3: Customize and Configure

Custom GPT image3

Now navigate to the "Configure" tab to further tailor your GPT's settings:

  • Name & Profile image - Change if desired. You can also upload your own image.
  • Description - A summary of what your GPT is all about. Descriptions cannot be longer than 300 characters.
  • Instructions - Add any other preferences for how your GPT should behave.
  • Conversation starters - You can customize what prompts are visible for the user at start.
  • Knowledge - Upload any documents, data sources, or other info for your GPT to reference. This additional context will make your GPT more knowledgeable. There seems to be a limit of ten files you can upload, and each file size limit is 512MB.

    Tip: There are two workarounds for the ten file limitation:

    1. Add more data into one file. If you use docx files, the file size stays reasonable, and the analyzing time is not long.

    2. You can archive all your files into a zip file and upload it to the GPT.
    Enable the code interpreter and use the prompt "unzip the file, deeply analyze all data, store it as knowledge, and update GPT."

    However, with the second method, there is a caveat: the GPT stores only a summary of the data, not the whole data.
  • Capabilities - Enable/disable web browsing, DALL-E image generation, and code execution as needed. 
  • Actions - Connect your GPT to external services via Zapier custom GPT integrations to expand functionality.

Step 4: Test Conversationally

Go back to the Create tab to try out your GPT. Engage conversationally via the provided prompts and your own questions. Observe how it responds in various situations.

Use these test conversations to identify any gaps in the GPT's knowledge or inadequate answers. Determine if any additional training instructions or source materials need to be added.

Step 5: Save and Share

Custom GPT image4

When you're satisfied with your custom ChatGPT, click "Save" in the upper right corner.

Choose who can access your GPT:

  • Only you 
  • Anyone with the link
  • Public (listed in OpenAI's GPT Store)

Click confirm, and your GPT is ready to assist users with your specified task!

Pro Tips for GPT Success

Here are some of my expert recommendations for getting the most out of your custom assistant:

  • Start small - Don't attempt overly complex GPTs as your first project. Begin with a narrow use case.
  • Keep instructions concise - Be brief and clear with your setup guidance. Don't overload your GPT.
  • Backup instructions - Store your GPT's instructions separately to prevent potential loss when adding new ones, as GPT may replace old instructions with new ones.
  • Monitor responses closely - Check responses for accuracy and relevance, especially after configuration changes.
  • Use plain language - Don't worry about trying to sound technical. The GPT builder understands natural speech.
  • Personalize with data - Upload documents, product specs, or other materials relevant to your GPT's specialty.
  • Test privately first - Have trusted users vet the GPT before publishing it publicly.
  • Update continuously - Add to your GPT's knowledge base and refine its capabilities over time.

The Power of AI in Your Hands

ChatGPT is groundbreaking, but custom GPTs directly put that conversational AI power in your hands. You can build an AI assistant tailored to your specific needs with just a bit of guidance.

GPTs open up exciting possibilities for personal productivity, business efficiency, lead generation, and new income streams. As OpenAI continues to develop this technology, customizing AI will only get easier.

Now is the perfect time to start experimenting with creating your own GPTs. Begin with a simple use case that solves a real problem for you or others. This exciting technology allows you to develop a virtual assistant capable of delivering immense value.

Unleash your creativity to build the GPT of your dreams - the possibilities are endless!

Read also: What we know so far about GPT-5?

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