SMRTR AIAug 30, 2026Hacker News

Build a Tokenizer from Scratch

SMRTR summary

This guide walks through building a byte-level BPE tokenizer from scratch, the same encoding method used by modern LLMs. Starting with a simple word tokenizer, you progress through implementing BPE, optimizing training speed, and exporting a working multilingual tokenizer compatible with tiktoken, complete with a web playground.

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