zurawiki/tiktoken-rs

tiktoken is a fast BPE tokeniser for use with OpenAI's models.

The fastest JavaScript BPE Tokenizer Encoder Decoder for OpenAI's GPT models (gpt-5, gpt-o*, gpt-4o, etc.). Port of OpenAI's tiktoken with additional features.

Count and truncate text based on tokens

Minimal, clean code for the Byte Pair Encoding (BPE) algorithm commonly used in LLM tokenization.

💥 Fast State-of-the-Art Tokenizers optimized for Research and Production

Language model tokenization at GB/s

Easy token price estimates for 400+ LLMs. TokenOps.

Claude Usage Tracker

Find the ghost tokens. Fix them. Survive compaction. Avoid context quality decay.