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AI Agent Development

Creating Your Own AI Agent Using OpenAI (Agent Builder, GPT-5, Chatkit, Cloudflare, MCP, Fine Tuning, CoT, etc.)

Create a multi-agent system app with Agent Builder and Chatkit, and deploy the app with Cloudflare. All the latest technologies including GPT-5, Agent Builder, Chatkit, MCP, Fine Tuning, CoT have been incorporated.

(5.0) 55 reviews

1,044 learners

Level Beginner

Course period Unlimited

  • AI CASTLE
openai
openai
multi-agent
multi-agent
LLM
LLM
Fine-Tuning
Fine-Tuning
AI Agent
AI Agent
openai
openai
multi-agent
multi-agent
LLM
LLM
Fine-Tuning
Fine-Tuning
AI Agent
AI Agent

Reviews from Early Learners

Reviews from Early Learners

5.0

5.0

angellike

100% enrolled

Thank you for teaching in such a calm and easy-to-understand way. I look forward to seeing you again next time.

5.0

NoCodeMaster

100% enrolled

We took this course together in our company study group, and everyone had high satisfaction with it.

5.0

김수빈

85% enrolled

The course flow is naturally structured and easy to understand. I was able to grasp the overall process of agent development. The explanations are well done so that even beginners can easily follow along.

What you will gain after the course

  • Create Your Own AI Agent in Just 10 Minutes

  • Implementing Multi-Agent Systems with OpenAI Agent Builder

  • Create Apps Easily and Quickly with OpenAI Chatkit

  • Deploying My Agent App with Cloudflare

  • Understanding and Practicing Prompt Engineering and CoT (Chain of Thought)

  • RAG (Retrieval-Augmented Generation) for Large-Scale Document Processing

  • From utilizing MCP (Model Context Protocol) to directly deploying servers

  • Creating Your Own LLM by Training with Fine Tuning on Your Personal Data

Without a doubt, this is the best AI agent course.

This course is about creating your own AI agent using the Agent Builder from the OpenAI Platform.

Both developers and non-developers can take this course.

ℹ️ What is Agent Builder

  • The official launch of Agent Builder was announced at OpenAI DevDay in October 2025.

  • Anyone can easily and quickly configure multi-agent workflows using a drag-and-drop method.

  • Next-generation AI agent development platform that is attracting significant attention and being rapidly adopted by both enterprises and developers.

Course Features

Utilizing Self-Made Ebooks from Kind Explanations

Hands-on lectures that even beginners can easily follow

Ebook Link: https://openai-agent.aicastle.school


Inflearn Events for Students 🎉

  • We provide free practice support for those taking courses through Inflearn, without worrying about costs or organizational setup (card registration, organizational verification).

  • Additionally, the course provides guidance on cost reduction methods using free quotas on the OpenAI Platform.

  • Content related to events and free quotas is [03. Setting Up Organization and Receiving Free Quota] is covered in the lecture.


You'll learn this kind of content

Agent Builder

Learn how to implement Multi Agent System (MAS) workflows quickly and easily using drag and drop with Agent Builder.

Configuring Workflows with Agent Builder

Chatkit

Chatkit is a chat interface provided by OpenAI. You'll learn how to integrate workflows created in Agent Builder with Chatkit to develop sophisticated apps easily and quickly.

Creating an app with Chatkit

Cloudflare

Learn how to deploy a stable and fast agent app for free anywhere in the world using Cloudflare Pages' globally distributed edge server network.

Deploying Apps with Cloudflare Pages

GPT-5

We will proceed with the practice using OpenAI's latest model, GPT-5. By utilizing GPT-5's built-in reasoning capabilities, we can implement logical responses without the need for a CoT process.

Reflecting the latest GPT-5 model

MCP (Model Context Protocol)

You'll learn how to integrate external tools (Google Drive, Email, Calendar, etc.) on various MCP platforms like Zapier and Smithery. You'll also create and deploy your own custom MCP server.

MCP Google Drive Integration

RAG, Vector Store

Using File Search to understand the principles of RAG and Vector Store and conduct hands-on practice. Learn how to easily and quickly build large-scale document processing systems.

Explanation of RAG and Vector Store Principles

Code Interpreter

Data analysis has now become really easy. You can delegate data analysis tasks using Code Interpreter, OpenAI Platform's own tool. Learn how to analyze Seoul bicycle data in just 10 seconds.

Seoul Bicycle Data Analysis Practice

Fine Tuning

Learn how to create your own LLM model by training custom data through Fine Tuning. This allows you to reduce the amount of prompt engineering while improving performance and cost efficiency.

Fine Tuning Data Composition Practice

After taking the course

  • You can create and deploy your own agent in just 10 minutes.

  • You can implement advanced agent features that can be applied directly to real-world work.

  • You will understand the principles of LLM and agents, and be able to collaborate with AI-related professionals.



The person who created this lecture

  • This course was produced by the education team at AI Castle Co., Ltd.

  • The instructor who participated in creating this course has conducted artificial intelligence, cloud computing, and robotics lectures at numerous universities and companies, and is currently engaged in development and teaching work utilizing the latest artificial intelligence technologies.


Q. What is the difference between OpenAI Platform and ChatGPT?

OpenAI Platform is a platform for creating developer-friendly custom agents.

While ChatGPT targets general users who use the completed app, OpenAI Platform is designed for developers who want to create custom agent apps.

While the OpenAI Platform was created for developers, its simple UI-based interface makes it easy for anyone to use.

Q. Why should I use OpenAI?

OpenAI is the most recognizable company and platform not only for developers but also for the general public.

Additionally, it is cost-effective compared to similar models from other companies, making it financially advantageous for custom app development.

OpenAI is not simply focused on developing artificial intelligence models, but also provides various convenient tools that allow customers to easily create their own agents. Therefore, it is possible to create apps more easily and quickly compared to other platforms.

Q. Can ordinary people with no development experience also take this course?

Yes, it's definitely possible. Agent Builder is a drag-and-drop UI-based agent creation tool that can be easily accessed not only by developers but also by general users. When creating AI agents, understanding the principles and structure is more important than programming. This course is designed to help you understand the principles and structure of AI agents and apply them to practice so that you can solve your own problems.

Pre-enrollment Reference Information

Practice Environment

All hands-on exercises in this course are conducted through web browsers. If your web browser works well, there are no additional programs you need to install separately. (MCP program exercises are also conducted through Github Codespaces, a web-based development environment.)

Learning Materials

Prerequisites and Important Notes

  • This course is designed so that anyone can take it without prerequisite knowledge.

  • The programming parts (Python) are only included in the [Advanced] MCP Server Development section in the latter half of the course, and even this section is structured so that non-developers can complete the exercises without any issues through vibe coding (delegating coding to AI).

Recommended for
these people

Who is this course right for?

  • Anyone who wants to easily and quickly create their own AI agent app

  • Those curious about the principles of LLM and Agent

  • Someone who wants to introduce agents into their practical work

  • Those who want to understand the latest technologies such as RAG, MCP, MAS, etc.

Hello
This is

1,909

Learners

152

Reviews

5

Answers

4.8

Rating

3

Courses

  • AI Castle Co., Ltd. provides outsourced management for AI education as well as related competitions and events.

  • Inquiries: contact@aicastle.com

🚀 Learn more about outsourcing education, competitions, and events


AI Education Outsourcing Operations

We plan and operate AI education programs for elementary, middle, and high schools, universities, and corporations. We provide participants with valuable experiences through curricula that reflect the latest AI technology trends and practice-oriented training.

Photo: Teacher Training Program

Image description

Outsourcing of AI Competition Operations

Based on what they have learned, students will develop their own AI projects and compete by submitting them to the competition. Through this process, students can foster a competitive spirit and further develop the competencies required in the industry.

Photo: COSS Future Automotive Consortium

Image description

AI Event Operation Outsourcing

We plan and operate various AI-related events. We provide opportunities for participants to experience and learn about the latest AI technologies.

Photo: DIFA AI Autonomous Driving Experience Booth

Image description

Curriculum

All

27 lectures ∙ (6hr 7min)

Published: 
Last updated: 

Reviews

All

55 reviews

5.0

55 reviews

  • angellike님의 프로필 이미지
    angellike

    Reviews 18

    Average Rating 4.7

    5

    100% enrolled

    Thank you for teaching in such a calm and easy-to-understand way. I look forward to seeing you again next time.

    • nocodemaster592817님의 프로필 이미지
      nocodemaster592817

      Reviews 1

      Average Rating 5.0

      5

      100% enrolled

      We took this course together in our company study group, and everyone had high satisfaction with it.

      • subin153463님의 프로필 이미지
        subin153463

        Reviews 3

        Average Rating 5.0

        5

        85% enrolled

        The course flow is naturally structured and easy to understand. I was able to grasp the overall process of agent development. The explanations are well done so that even beginners can easily follow along.

        • leeseo461825님의 프로필 이미지
          leeseo461825

          Reviews 1

          Average Rating 5.0

          5

          85% enrolled

          The content was great as it focused on essential and necessary material compared to other courses. It's much easier than n8n while still being deep in content. I recommend it to those who need to quickly create agents.

          • ssmktr9286님의 프로필 이미지
            ssmktr9286

            Reviews 11

            Average Rating 5.0

            5

            33% enrolled

            $59.40

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