We work with you to design, build and deploy branded GPTs using OpenAI technology. These assistants help your team work faster, support your users, and make your knowledge go further.
What is a custom GPT?
A custom GPT is your own AI assistant, trained on your organisation’s knowledge and tuned to reflect your tone of voice, values, and goals. Built using OpenAI’s ChatGPT platform, it runs securely in the cloud.
Your GPT can:
- Write or rewrite content in your voice
- Answer questions about your services
- Search internal content (PDFs, docs, FAQs)
- Offer instant support to staff or users
- Help train, onboard or guide teams
Whether you want to streamline content production, create a searchable knowledge base, or deliver personalised advice at scale, we’ll work with you to make it happen – quickly, ethically and affordably.
We design them to be useful. You decide how it grows.
What we offer
Every project starts with a discovery call. From there, we tailor what you need. Here’s what we can deliver:
1. Strategy + scoping
What problem are we solving? We help define your use case, audiences and success metrics.
2. Build your GPT
We’ll train and build a custom GPT using your content and branding. Delivered through ChatGPT or API (including Google Docs integrations).
3. Test + refine
We work with you to refine the model, improving answers, tone and user experience.
4. Launch + support
We’ll guide you through launch, help onboard your team, and offer ongoing support as your GPT evolves.
Pricing (no hidden costs)
Essentials – £950
- One custom GPT
- Up to 10 source documents
- Branded instructions, tone of voice
- Delivered in ChatGPT
- One round of testing + support
Advanced – £1,750
- Includes Essentials, plus:
- User guide + onboarding support
- Optional API access setup
- Two refinement rounds
- Basic prompt library + analytics setup
Enterprise / Bespoke
- Custom projects
- Multiple GPTs or departments
- Integration with other systems
- Training + governance
Price on request
Why 42group?
We’re a team of expert communicators, trusted by the NHS, global charities and leading agencies. With 42ai, we combine that human insight with technical skill – giving you AI tools that reflect your values, solve real problems, and scale without risk.
We don’t just prompt ChatGPT. We partner with you to build something better that combines human expertise and creativity with the speed and scale of AI.
Our skills are in creating content that builds human connections. We’re using technology to do it.
Want to see a custom GPT in action? We’ve got demos to share.
Get in touch today and we’ll show you the impact a custom GPT can have on your workflow and bottom line.
Book a call