How ChatGPT Generates Text (Step-by-Step) | Tokens, Embeddings & Transformers Explained

bytesnbrews — Wed, 01 Jul 2026 16:23:59 +0000

Have you ever wondered what happens inside ChatGPT after you type a prompt?

Most people think AI understands language the way humans do. But under the hood, something very different is happening.

This video will break down the complete text generation pipeline used by modern Large Language Models (LLMs) like ChatGPT, GPT-4, and Llama.

It will show:

• What tokens are and why words are converted into token IDs
• How embeddings transform numbers into meaning
• What the Transformer architecture actually does
• How Attention helps the model understand context
• Where billions of parameters fit into the picture
• How logits become probabilities
• What temperature and sampling really do
• Why ChatGPT generates one token at a time
• How a sequence of numbers ultimately becomes language

By the end of this video, you'll understand the entire journey from:

Text → Tokens → Embeddings → Transformer → Probabilities → Sampling → Response

Whether you're a beginner, software engineer, data engineer, AI enthusiast, student, or simply curious about how ChatGPT works, this video will give you a solid mental model of what's happening behind the scenes.

DEV Community: bytesnbrews

How ChatGPT Generates Text (Step-by-Step) | Tokens, Embeddings & Transformers Explained