Custom GPT Tool & Prompt Design

Ben Williamson

Starting at

650

About this service

Summary

AI tools should reflect the people who use them—not just the data that built them. This service is for mission-driven teams, educators, and community orgs who want a GPT that’s clear, helpful, and aligned with their values. Whether you're building a tone-checking assistant, an inclusive language guide, or a structured workflow tool, I’ll design a custom GPT that supports your team with clarity, care, and intention.

Unlike off-the-shelf automation, your GPT will be designed to speak your voice, honor your audience, and offer practical support with human-centered logic. I work closely with you to shape the GPT’s personality, tone, system design, and reference materials—so what you end up with isn’t just useful, but truly affirming for your team or community.

Tiered Pricing Options

Starter Tier – $650: Basic GPT design and build with 1 feedback round. Best for internal tools, MVPs, or small teams testing new workflows.

Standard Tier – $1,100: Includes onboarding documentation and up to 2 feedback rounds. Ideal for orgs rolling out the GPT across teams or programs.

Extended Tier – $1,600: Includes multiple structured knowledge files and a live or recorded training session for your team. Best for tools with public use, volunteer training, or complex internal logic.

Process

Intake form or discovery call to define your GPT’s voice, role, and scope

Draft system design including tone, logic, and stored knowledge

Build and test your GPT (no Actions required)

Up to 2 rounds of edits based on your feedback

Final delivery: live link + onboarding guide

FAQs

Do I need to know how to code?
Nope! I handle the build and formatting—you just need to share your goals and content.
What can a GPT actually do for my team?
It can write inclusively, offer tailored guidance, assist with workflows, help onboard volunteers, or standardize tone across content.
Is this aligned with accessibility and inclusion?
Absolutely. I design every GPT with audience-specific tone, respectful defaults, and affirming language—especially for queer, neurodivergent, or community-led use cases.

What's included

Custom GPT System Design
A 1–2 page strategy doc defining your GPT’s function, tone, use case, and instructions—mapped to audience needs and desired outcomes. Includes 1 revision round.
Custom GPT Build & Test (No Actions)
A fully functional GPT built using structured knowledge, system prompt design, and embedded usage guidance. Includes light user testing and up to 2 real-world examples.
Starter Documentation or Onboarding Guide
A 2–4 page user-friendly guide covering how to use, share, and update your GPT. Ideal for internal onboarding, client training, or open community use.

Example projects