How to Build an LLM from Scratch in Python Using AI (For Beginners)

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In the next 10 minutes, you’re going to learn how to build a complete Large Language Model from scratch using nothing but Python and one AI tool. We’ll go from zero lines of code to having your own ChatGPT running on your computer.

Now, most people think you need a PhD in machine learning or years of coding experience to build something like this. But here’s what’s crazy – with the right AI tools, a complete beginner can create their own language model in just a few hours.

But we’re not just going to show you the pretty end result. We’re going to tackle the three biggest challenges that stop most people: setting up the development environment without breaking your computer, processing massive datasets without your system crashing, and building a transformer architecture that actually works.

And here’s what makes this different from every other AI tutorial out there – we’re not just copying code. We’re using Claude AI as our coding partner to explain every single step, troubleshoot problems in real-time, and customize everything for your specific setup.

By the end of this video, you’ll have your own trained language model, a desktop application to test it, and most importantly, you’ll understand exactly how modern AI actually works under the hood.

Date: November 20, 2025

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