Udemy

Build Chat Applications with OpenAI and LangChain

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  • 1,146 Students
  • Updated 6/2025
  • Certificate Available
4.5
(159 Ratings)
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Course Information

Registration period
Year-round Recruitment
Course Level
Study Mode
Duration
4 Hour(s) 4 Minute(s)
Language
English
Taught by
365 Careers
Certificate
  • Available
  • *The delivery and distribution of the certificate are subject to the policies and arrangements of the course provider.
Rating
4.5
(159 Ratings)

Course Overview

Build Chat Applications with OpenAI and LangChain

Gain cutting-edge AI skills: Master the LangChain framework to build and deploy real-world AI applications

Are you an aspiring AI engineer excited to integrate AI into your product?

Are you thrilled about the breakthroughs in the field of AI?

Or maybe you’re eager to learn this new and exciting LangChain framework everyone’s talking about.

If yes, then you’ve come to the right place!

Why should you consider taking this LangChain course?

In this Build Chat Applications with OpenAI and LangChain course, we’ll explore the increasingly popular LangChain Python library to develop engaging chatbot applications.

With detailed, step-by-step guidance, you will use OpenAI’s API key to access their powerful large language models (LLMs). Once we have access to foundational models, we'll utilize LangChain and its integrations to create compelling prompts, add memory, input external data, and link it to third-party tools.

LangChain's integration with third-party tools distinguishes it by enabling connections to various language models and loading documents in multiple formats. It also allows for selecting suitable embedding models, storing embeddings in a vector store, and linking to search engines, code interpreters, and tools like Wikipedia, GitHub, Gmail, and more.

None of this would be possible without mastering the LangChain Expression Language (LCEL)—essential for developing stateful, context-aware reasoning chatbots. These chatbots remember past conversations, answer questions about unseen data, and tackle more complex problems.

Additionally, we’ll spend much of our time discussing the state-of-the-art Retrieval Augmented Generation (RAG), both theoretically and practically. This technique allows LLM-powered applications to analyze and answer questions about information outside their training data. Ultimately, we’ll create a chatbot that answers students’ questions on courses from the 365 library.

What skills do you gain?

- Integrate existing applications with powerful LLMs.

- Connect to OpenAI’s language and embedding models using an OpenAI API key.

- Develop prompt engineering techniques to enhance AI response performance and relevance.

- Implement RAG to enrich your AI-driven product with a knowledge base.

- Master the LCEL protocol—essential for developing applications with the LangChain Python library.

- Connect external tools to your LLM-powered application.

- Understand the mechanics behind agents and agent executors.

Enhance your career prospects with rare and highly sought-after AI Engineering skills by enrolling in this LangChain and OpenAI course.

Click ‘Buy Now’ and acquire real-world AI engineer skills today!

Course Content

  • 8 section(s)
  • 51 lecture(s)
  • Section 1 Introduction to the Course
  • Section 2 Tokens, Models, and Prices
  • Section 3 Setting Up the Environment
  • Section 4 The OpenAI API
  • Section 5 Model Inputs
  • Section 6 Output Parsers
  • Section 7 LangChain Expression Language (LCEL)
  • Section 8 Retrieval Augmented Generation (RAG)

What You’ll Learn

  • Master LangChain to seamlessly integrate existing applications with potent Large Language Models (LLMs)
  • Learn to connect to OpenAI’s language and embedding models
  • Develop prompt engineering skills that improve performance and relevance of AI responses
  • Apply the state-of-the-art Retrieval Augmented Generation (RAG) technique to empower your AI-driven product with a knowledge base
  • Leverage AI to open up endless opportunities for your organization
  • Enhance your career prospects with rare and highly sought-after AI Engineering skills


Reviews

  • M
    Mark Fu
    5.0

    Best Udemy course I have taken. Well organized; packed full of information with hands-on examples. Some items were slightly outdated, but it was easy to resolve those.

  • A
    Anjali Diwalkar
    5.0

    Things are easily explained.

  • A
    Abhisek Bag
    4.5

    good

  • M
    Miguel Ronaldihno Maguiña Calvo
    5.0

    I just finished this LangChain course and honestly, it’s the best one I’ve taken so far. The content is clear, well-structured, and incredibly didactic, making even complex concepts easy to understand. The examples are precise and practical, showing exactly how to apply what’s being taught. I also appreciated the thoughtful recommendations that go beyond the basics, helping me see how to use LangChain effectively in real projects. Overall, this course combines clarity, depth, and usefulness in a way that really stands out. Highly recommended for anyone wanting to learn LangChain the right way!

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