Ep2: I Built a Free AI Roast Generator with LangChain 2025! Learn PromptTemplate + LCEL

In this video, you’ll learn how to build a fun and practical AI project: a personalized Tweet/Roast Generator using LangChain 2025 and GitHub Models for free. This tutorial introduces PromptTemplate, ChatPromptTemplate, and the LCEL pipe operator, showing how these powerful components let you build clean, reusable AI pipelines with just a few lines of code.

You’ll learn how to structure prompts, format conversation flows, connect a GitHub-hosted LLM (GPT-4o-mini), and generate playful tweets using real user inputs. Whether you’re a complete beginner or an intermediate developer wanting to understand LangChain’s modern workflow, this video delivers a clear, hands-on introduction.