Custom GPT Development

Why Businesses Are Investing in Custom GPT Development

Because generic AI is not enough. If you want precision and performance, you need tools shaped around your data and goals.

Custom GPTs enable:

  • Better outputs from day one – trained on your workflows and language.
  • Faster work – structured prompts that mirror how your team operates.
  • Consistent answers – on-brand, compliant and repeatable.
  • Integration – connects with the tools you use for smoother delivery.
  • Control – you own the prompts, datasets and guardrails.

It is not about replacing people. It is about helping them do their best work.

Custom GPT Development Process

1 – Discovery

We learn your goals, map high-impact use cases and define what good looks like.

2 – Data and prompt architecture

We structure prompts and connect the right knowledge via uploads, APIs or retrieval so the GPT can think and speak like your brand.

3 – Build and test

We develop, test and refine your GPT, then deploy it where you need it – web, app or inside your tools.

4 – Launch and support

We train your team, encourage adoption and iterate as your needs evolve.

Our Custom GPT has genuinely transformed the way we work. Our reception team now uses it to quickly find answers to questions about our products and services – it’s like having instant access to a living knowledge base. It also helps our team draft email responses automatically, which has saved a huge amount of admin time. We’re now spending less time on repetitive tasks and more time focusing on what matters. If efficiency is a priority, this is a no-brainer.

- Jonny Alberto, The Forbury Clinic
View All Testimonials

  • How does a Custom GPT work?

    A custom GPT is trained on your business knowledge and guided by prompts that reflect your processes. It generates content, answers and analysis in your voice and context.

  • How much does it cost?

    EIAI is our most accessible route with a lower one-off build and a simple monthly fee. Simple assistants start from £1,000 to £2,500, advanced from £5,000. If you want to own your IP, bespoke projects usually start from £20,000.

  • Isn’t this just like training my own ChatGPT?

    No. A custom GPT is purpose-built around your content, systems and goals with clearer control and deeper integration.

  • Do I own the GPT?

    Yes. The prompts, datasets and integrations we create for you are yours.

  • How long does it take to build?

    Most business-ready GPTs are developed and tested within 2-6 weeks. Larger builds can take longer depending on scope and data.

  • Do I need technical skills?

    No. We deliver no-code and technical builds. We can collaborate with your dev team or handle everything end-to-end.

  • What kind of results can I expect?

    Clients typically see faster responses, reduced admin and more consistent outputs, freeing teams to focus on higher-value work.