---
title: "I Will Build a Custom AI Chatbot Using ChatGPT and LangChain"
url: https://zinnhub.com/zinns/develop-ai-chatbot-with-chatgpt-llm-openai-langchain-pinecone/
description: "Get a bespoke AI chatbot trained on your own documents — built with OpenAI, LangChain and Pinecone by a London-based LLM development studio. Available 24/7, infinitely scalable, and tailored precisely to your business."
published: 2025-12-20T05:48:30+00:00
modified: 2026-10-19T17:40:57+00:00
language: en-GB
---

# I Will Build a Custom AI Chatbot Using ChatGPT and LangChain

Your customers expect instant, accurate answers — around the clock. A [custom AI chatbot](https://zinnhub.com/zinns/create-ai-chatbot-or-custom-chatgpt-saas-website-using-openai-gpt-4/) trained on your own documents delivers exactly that, without the overhead of additional support staff.

Zinn Digital® is a London-based development studio specialising in LLM applications built with the OpenAI API, LangChain, and Pinecone. Whether you need a document-aware chatbot for customer support, internal knowledge management, or product guidance, we architect solutions that are tightly scoped to your business requirements.

\*\*What this service covers\*\*

At the entry tier, you receive a focused 40-minute consultation. We use this time to map your requirements, explore the right architecture for your use case, assess your documents and data sources, and outline a clear delivery plan. This is the essential first step before any build begins — it ensures nothing is wasted and the solution fits your business precisely.

The Boost tier delivers a fully functional, production-ready AI chatbot: document ingestion, vector embedding via Pinecone, a conversational interface [powered by OpenAI](https://zinnhub.com/zinns/build-your-business-centric-custom-ai-chatbot-with-zinn-digital/) and LangChain, and two rounds of revisions to get everything exactly right.

The Premium tier expands the scope further — a more comprehensive build accommodating larger document sets, greater complexity, deeper customisation, and three rounds of revisions. This is the right choice for businesses that need a robust, scalable chatbot ready to handle real-world volume from day one.

\*\*How it works\*\*

1. You place your order and share details about your project via the order chat.
 2. We review your requirements and align on scope.
 3. For consultation orders, we schedule and conduct the 40-minute session. For build tiers, development begins immediately.
 4. Deliverables are shared via a secure cloud link, with source code and documentation included.

\*\*Who this is for\*\*

This service suits businesses of any size that want to harness AI to improve customer engagement, reduce support load, or make internal knowledge instantly accessible. It is ideal for SaaS companies, professional services firms, e-commerce businesses, and teams managing large document libraries.

\*\*Why Zinn Digital®\*\*

Our expertise spans LLM application development, web development, web automation, and Chrome extensions — all under one roof. We work in TypeScript, use best-in-class tooling, and have deep hands-on experience with the OpenAI API, LangChain, and Pinecone. Every solution is bespoke; nothing is templated. We are based in London, England, and communicate clearly throughout every engagement.