TLDR Tech / AI
Reverse-Engineering the OpenAI's GPT-5 Tokenizer: What 200,000 Tokens Reveal About AEO/GEO
Text has to pass through a tokenizer before GPT-5.x is able to understand any input. A tokenizer is a compression layer that converts raw text into a sequence of integer IDs. Every design decision baked into the tokenizer has downstream consequences for cost, accuracy, multilingual performance, and hallucination rates. This article looks at OpenAI's open-source tokenizer library, tiktoken, and explains how it works.
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