How to Create Your Own GPT (Custom GPT Guide For Prompt Engineers)
Why Create a Custom GPT?
Creating your own GPT allows you to embed your expertise into a personal AI assistant.
For example, the Diffusion Prompts GPT is designed to:
Generate advanced prompts for AI image models
Customize prompts based on style, model, and use-case
Include uploaded prompt templates and keyword libraries
Provide efficient, cinematic, and technically accurate prompts
Step-by-Step: Creating a GPT with OpenAI
- Go to https://chat.openai.com/gpts
Sign in with your OpenAI account (ChatGPT Plus recommended). - Click Explore GPTs Then Create
- Fill in the Required Sections in the GPT Builder Wizard:
GPT Name:
> `Diffusion Prompts GPT`
Choose a name that is clean, descriptive, and searchable.
Instructions:
Tell the GPT how to behave. Example:
" You are a prompt engineer specialized in AI image generation. You generate creative and technically accurate prompts for models like SeaArt, Flux, SDXL, and Leonardo.Ai. You always include model compatibility notes, use-case based structure, and stylistic descriptors. Avoid vague or overly poetic phrases unless asked."
Prompt Examples:
Define how users should interact. Example:
User: Generate a prompt for a fantasy landscape using SDXL.
GPT: A vast misty valley with ancient ruins overgrown with moss, early morning fog, soft light scattering through trees, cinematic wide-angle shot, painted in a style inspired by Moebius and Simon Stalenhag.
Profile Image:
(Optional) Upload a logo or avatar image.
Knowledge Upload:
Upload a `.txt` or `.pdf` file containing your prompt guide:
> Ideal example: `Diffusion_Prompts.txt`
My promt guide: https://drive.google.com/file/d/1d8B9zEM16A1xGiibGAQJWj6179a_h54T/view?usp=sharing
Publishing and Sharing
After creating your GPT:- Set it as Private or Public- Copy your shareable link from the settings
Example (My Gpt): https://chatgpt.com/g/g-67dac05ec7e481918a4c746fa03aa78d-diffision-promts
Bonus Features to Add
- Categorized use-case examples (character, landscape, product mockup)
- Uploadable prompt templates and structure guides
- Model-specific adjustments and CFG values
- Magic word libraries and keyword boosters
With this setup, your GPT becomes a true creative assistantperfect for AI image creators, storytellers, and style explorers.
