Inside Large Language Models like GPT

Title: Inside Large Language Models like GPT

URL Source: https://medium.com/@farazkazi1470/inside-large-language-models-like-gpt-46664ad52729?source=rss------artificial_intelligence-5

Published Time: 2026-04-20T18:12:47Z

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# Inside Large Language Models like GPT | by faraz Kazi | Apr, 2026 | Medium

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# **Inside Large Language Models like GPT**

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_How does a machine learn to talk, write, and think — like a human?_

A student-friendly deep dive into the world of Large Language Models

Have you ever wondered how ChatGPT can write an entire essay, debug your code, or even crack a joke? A few years ago, this felt like science fiction. Today, it’s your homework helper, your customer support agent, and sometimes, your therapist at 2 AM.

But here’s the thing — none of this is magic. Under the hood, there’s a very clever piece of technology called a Large Language Model, or LLM. In this blog, I’m going to walk you through exactly how these models work — from the ground up — in a way that actually makes sense, even if you’re just getting started with deep learning.

**Let’s go.**

## 1. What Even Is a Language Model?

Before GPT, before ChatGPT, before all the hype — language models existed in simpler forms. Your phone’s keyboard predicting the next word as you type? That’s a language model. Gma