I Built a BPE Tokenizer From Scratch in Python And Finally Understand How LLMs Work

📰 Medium · Machine Learning

I built a BPE tokenizer, the same tokenization algorithm used inside ChatGPT, GPT-4, and Qwen3 etc from scratch in plain Python. Continue reading on Medium »

Published 28 May 2026

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I built a BPE tokenizer, the same tokenization algorithm used inside ChatGPT, GPT-4, and Qwen3 etc from scratch in plain Python. Continue reading on Medium »

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