Custom GPT and ChatGPT Integration Trained on Your Data
Custom GPT development means building an AI assistant on top of GPT models that is trained on your own business data using RAG, so it answers from your documents instead of generic knowledge. We build private custom GPTs for your team and embed ChatGPT-style assistants in your website, apps and tools, with guardrails and access controls.
Why choose EPIXS for custom gpt / chatgpt
Custom GPTs and ChatGPT integrations trained on your business data with RAG, so staff and customers get accurate, grounded answers. Free quote.
- Answers grounded in your own documents, not generic web knowledge
- Private GPTs for staff: search policies, draft replies, summarise files
- Embed a ChatGPT-style assistant inside your website, app or tools
- Keep sensitive data controlled with access rules and guardrails
- Connect to your systems so the GPT can fetch live information
- Reduce time spent hunting through documents and writing repetitive replies
A ChatGPT that knows your business, not just the internet
Off-the-shelf ChatGPT is brilliant at general tasks but knows nothing about your products, policies or customers, and it will confidently make things up to fill the gap. A custom GPT fixes that. We connect your own data, manuals, SOPs, product specs, contracts, FAQs, using retrieval-augmented generation, so the assistant answers from your material with citations back to the source. That is what makes it safe to put in front of staff and customers.
We build two flavours. Internal custom GPTs help your team search policies, draft proposals, summarise long documents and answer process questions in seconds. Customer-facing ChatGPT integrations live inside your website, app or product and answer questions or guide users. Both can be wired to your systems so the GPT pulls live data, an order status, an inventory count, a booking slot, rather than relying on a static snapshot.
- Internal: search SOPs, draft replies, summarise documents
- Customer-facing: embedded assistant in your site or app
- Connected: pulls live data from your systems via tools
- Custom GPT
- A GPT-based assistant configured with your instructions, data and tools so it specialises in your business instead of being generic.
- RAG (Retrieval-Augmented Generation)
- Retrieving relevant passages from your own data and feeding them to the model so answers stay grounded and citable.
- Embeddings
- Numeric representations of your text that let the system find the most relevant passages to answer a question accurately.
- Hallucination
- When an AI invents a confident but wrong answer. Grounding with RAG and guardrails is how we keep it from happening.
- Guardrails
- Rules and limits that keep the assistant on-topic, within policy and away from data it should not touch.
- 1Week 1Foundation
Scope & data
We define the use case and gather the documents and systems the GPT will draw on.
- 2Week 1-2Build
Build & ground
We index your data with RAG, write the instructions and set guardrails and access controls.
- 3Week 2Connect
Connect tools
Wire the GPT to your systems so it can fetch live data and take supported actions.
- 4Week 3Launch
Test & deploy
We test for accuracy and safety, then deploy internally or embed it customer-facing.
- 5OngoingOptimise
Maintain
We keep the knowledge current, monitor answers and refine prompts and guardrails.
Custom GPT / ChatGPT — FAQs
What's the difference between ChatGPT and a custom GPT?
ChatGPT is a general assistant that knows nothing about your business. A custom GPT is configured with your data, instructions and tools, grounded with RAG, so it answers from your material and connects to your systems.
Will it make things up?
We minimise that by grounding answers in your documents with RAG and adding guardrails, so the assistant answers from your source material with citations or admits it doesn't know, rather than inventing an answer.
Can it connect to our internal systems?
Yes. We can wire the GPT to your tools so it fetches live data, order status, inventory, bookings, and takes supported actions, instead of relying only on a static document set.
Is our data safe?
We design with access controls and guardrails, keep sensitive data scoped to the right users, and choose deployment options that fit your privacy and compliance needs. We discuss this during scoping.
How much does a custom GPT cost?
It uses a build-plus-retainer model: setup that scales with your data and integrations, plus a monthly retainer for usage and maintenance. Model usage is billed transparently. We quote per project, so ask for a free quote.
Ready to get started with custom gpt / chatgpt?
Tell us your goals and get a free, no-obligation proposal — usually within one business day.