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啥是 AI token?

发表于 : 03 6月 2026, 18:14
shepherd17

老羊倌不懂,于是上网查询。现把结果与大家分享。

Token(正式中文名:词元)是人工智能与大语言模型处理信息的基本单位。

你可以将它理解为人工智能阅读文字时使用的“积木”或“字词块”。AI 不直接认字,而是将你的文本拆分成 Token 后再进行计算和生成。

1,中文 Token 的长度概念

在中文语境下,Token 的长短取决于 AI 模型的切分规则(分词机制)。

粗略估算:通常 1个 Token 大约等于1到 2个汉字(平均约1.5个汉字)。

字符差异:常用的高频词或成语可能会被打包成一个 Token;而生僻字、数字、标点符号或英文字母可能会占用更多的 Token。

换算比例:1000 个汉字大约等于 600 到 700 个 Token。

2,核心作用与计费标准

计量单位:Token 数量决定了模型对话的上下文记忆上限(例如:最大支持 128k个 Token 的模型,大约能一次性阅读或输出近十万字的内容)。

计费标准:人工智能 API 接口通常以处理的 Token 数量(输入 + 输出总和)作为计费依据。想要节省成本,可通过精简提示词(Prompt)来减少 Token 消耗。

3,官方标准名称与延伸

官方定义:国家数据局明确 AI 的 Token 中文名为“词元”,它是智能时代可计量、可交易的基本信息单元。

在加密货币(Web3)领域,Token 常被称为“代币”;在安全登录领域常译为“权杖”,在 AI 领域请统称“词元”。


An AI token is the basic unit of data that a language model processes to understand and generate content. Often described as the "building blocks" of artificial intelligence, tokens can be complete words, parts of words, punctuation marks, or emojis.

How Tokens Work

The Rule of Thumb: In English, 1 token generally equates to about 4 characters, or roughly three-quarters of a single word. This means a 100-word paragraph is roughly 130 tokens.

Tokenization: Before an AI can process a prompt, its tokenizer algorithm breaks down your sentences into these manageable numeric IDs. Complex, rare, or non-English words require more tokens to process.

Why Tokens Matter

Cost Measurement: AI companies charge for their services based on the number of input tokens (what you type) and output tokens (what the AI generates). Because complex tasks require massive amounts of tokens, corporate AI budgets are skyrocketing, with some employees' daily usage costing hundreds of dollars.

The Context Window: Every model has a "context window" which caps the maximum number of tokens it can remember during a single conversation. Newer frontier models can hold millions of tokens at once, allowing them to process entire books or hours of video.