# How to Train ChatGPT on Custom Data: A RAG Application

DevFeed: [How to Train ChatGPT on Custom Data: A RAG Application](<https://devfeed.tech/articles/how-to-train-chatgpt-on-custom-data-a-rag-application-4511.md>)

Original publisher: [Read original article](<https://feeds.feedblitz.com/~/923992304/0/baeldung/cs>)

Author: Alexander Molochko

Published: 2025-08-28T23:27:05Z

Content type: tutorial

Language: en

Sources: [Baeldung - CS](<https://devfeed.tech/sources/baeldung-cs.md>)

Topics: [Language models](<https://devfeed.tech/topics/language-models.md>), [AI Chat](<https://devfeed.tech/topics/ai-chat.md>)

Tags: [apis](<https://devfeed.tech/tags/apis.md>), [chatgpt](<https://devfeed.tech/tags/chatgpt.md>), [deep-learning](<https://devfeed.tech/tags/deep-learning.md>), [deep-learning-chatgpt](<https://devfeed.tech/tags/deep-learning-chatgpt.md>), [embeddings](<https://devfeed.tech/tags/embeddings.md>), [how-to](<https://devfeed.tech/tags/how-to.md>), [rag](<https://devfeed.tech/tags/rag.md>), [retrieval](<https://devfeed.tech/tags/retrieval.md>), [vector](<https://devfeed.tech/tags/vector.md>)

## AI overview

A tutorial for building a ChatGPT-powered support chatbot with retrieval-augmented generation. It indexes PDF and CSV content in FAISS, retrieves relevant chunks, and adds them to prompts so responses are grounded in a custom knowledge base.

## Source excerpt

Learn how to use ChatGPT's APIs in a RAG application. The post How to Train ChatGPT on Custom Data: A RAG Application first appeared on Baeldung on Computer Science. Related Stories The Mixture-of-Experts ML Approach Download a Hugging Face Model Different Text Summarization Techniques Using Langchain