You can manually change the image, name, description, and instructions for your GPT by clicking Configure. Click the profile picture to change it, and edit the details in the NameDescription and Instructions fields to change them without typing prompts.

3. Establish a Tone and Rules for Your GPT

At this stage, your GPT wants to know how it should address users. Direct it to the tone and style you want it to adopt. Here, we said, "5e Dungeon Master should use a wise, sagely tone. Use language and style commonly used in high-fantasy settings," which fits quite nicely into the fantasy nature of D&D.

But, of course, if you are making a more professional GPT, ensure it uses professional language.

Now that your custom GPT has a tone, you should tell it how to behave. In our case, we want child-friendly Dungeons & Dragons campaigns that conform to PG-rated themes. We also let it have an inquisitive approach to understanding the player's actions instead of assuming what the player would do.

For a more wholesome grasp of the rules, you can open a new ChatGPT tab on your browser and research rules for your GPT. When finished, compile them into a notes app, number them, and paste them into the GPT Builder.

It's impossible to know how effective the rules you've established are without testing them in the playground on the right. Make prompts for breaking the rules and see if your GPT will prevent that from happening. This part of your GPT-making process will involve fine-tuning and testing.

For instance, The 5e Dungeon Master is supposed to strictly follow the rules of the D&D guidebook (PHB). Our test below shows how it prevents a payer from maxing out their stats and playing a potentially overpowered non-PHB race.

If you find that it's not fulfilling your instructions as well as you want, go back to the Create tab and give it further instructions. But remember that new instructions mean you've effectively created a new version of your GPT.

4. Upload Files as a Knowledge Base

In addition to backing up your GPT with rules, you can also upload files you would like your GPT to draw information from. In our case, we uploaded copies of the Player's Handbook by Jeremy Crawford and the Dungeon Master's Guide. Both are essential D&D books.

Here's how to upload source documents to your custom GPT:

Wait for it to finish uploading, and you'll have the documents as a knowledge base for your GPT.

If, for instance, you were trying to make a GPT that is an expert in Florida tax laws, you would get all the Florida tax legal documents you can find and upload them here to form a knowledge base your GPT can work with.

5. Add or Remove Capabilities

With ChatGPT Plus, you get a truly enhanced AI experience. These additional features include web browsing, a code interpreter, and DALL-E 3 integration. Better still, your custom-built GPT also enjoys all of these features. However, the GPT Builder gives you the option to add or remove functionalities you don't need.

All of these are enabled by default; in our example, we need all three. DALL-E 3 can create images of your characters and game scenes, the code interpreter helps it understand documents and character sheets you might upload, and you might need web-browsing to search up some general current facts.

However, a GPT like our hypothetical Florida tax lawyer may not need image creation functionality, and it might just be another useless feature.

With that in mind, here's how to tweak your GPT's capabilities:

6. Add APIs for Third-Party Services

For those interested in using APIs to access other third-party services in their GPTs, you'll be happy to know that it's possible.

Go back when you're finished.

If you don't enter a valid privacy policy, you won't be allowed to share your GPT with the public.

Currently, you seem to be able to add only one action at a time. If you click the Examples dropdown menu, you'll see a few examples of schemas OpenAI has added to aid in creating your own schema.

7. Configure Conversation Starters

Now that you've gotten most of the GPT building out of the way, you can add or remove conversation starters. They help you and others using your GPT to get into the flow of things.

Click Configure and scroll to Conversation starters. You'll notice that the AI automatically generates four of these. Go to the last empty field and type in a prompt to add a new conversation starter. Click the X next to a conversation starter block to remove it.

You can add more conversation starters as required.

8. Save and Publish Your GPT

In the future, we expect OpenAI will create a community marketplace for custom GPTs. But while a framework for it is in the works, it's not yet available. Still, you can save your GPT and view your builder profile by clicking the Save dropdown menu in the top-right corner.

While it won't make any difference, for now, you can choose whether you'd like to publish to the public, via links, or only to yourself. None of the sharing options work, by the way. We have to wait for an update. But, if you want friends to use your AI, return to ChatGPT's home, open the GPT's chat, and copy the URL in your browser's address bar.

If you click the pencil icon in the share menu, you'll enter your builder profile, where you can change your GPT and profile options when this feature is fully released.

ChatGPT's Limitations Still Apply to GPT Builder

You might be fooled by OpenAI's new UI and custom AIs, but don't forget that its limitations still apply. Fundamentally, it's still AI and suffers from the fundamental lack of creativity only humans can display.

What's more, as this technology emerges, OpenAI might struggle to maintain access to its servers with an influx of more users. Its usage cap for GPT-4 still applies, and that might get in the way of testing your custom AI.