tiktoken is a fast BPE tokeniser for use with OpenAI's models.
const tiktoken = require('tiktoken-node') let enc = tiktoken.getEncoding("gpt2") console.assert(enc.decode(enc.encode("hello world")) == "hello world") // To get the tokeniser corresponding to a specific model in the OpenAI API: enc = tiktoken.encodingForModel("text-davinci-003")
The open source version of tiktoken-node can be installed from npm:
npm install tiktoken-node