How many tokens is one word?

On average, one English word equals about 1.3 tokens. However, this varies significantly by word length and language. Short, common words like "the" or "is" are typically one token, while longer or uncommon words may split into two or more tokens. For non-English languages, especially those using no

Are tokens the same across all AI models?

No. Each model uses its own tokenizer and vocabulary, so the same text can produce different token counts depending on the model. For example, GPT-4 and Claude may tokenize special characters or non-English text differently. Always use the specific model's tokenizer — such as [OpenAI's tiktoken](/le

Why do tokens matter for AI API pricing?

AI providers charge per token for both input and output. This means your costs scale directly with how many tokens your prompts and responses contain. Understanding token counts allows you to estimate expenses, set budgets, and optimize prompts to reduce unnecessary spending. Our [API pricing guide]

What is a context window and how does it relate to tokens?

A [context window](/learn/understanding-context-windows) is the maximum number of tokens a model can process in a single request, including both your input and the model's output. For instance, a 128K-token context window can hold roughly 96,000 English words. Exceeding this limit means the model wi

How can I reduce the number of tokens in my prompts?

Write concise instructions, remove filler words, and avoid repeating context the model already has. Use structured formats like bullet points instead of verbose paragraphs. For code-heavy prompts, minimize comments and whitespace. Testing your prompts with a token calculator before sending them to t

What Are Tokens in AI? A Complete Guide for Developers

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Tokenization

Understanding Context Windows in AI: The Complete Developer Guide

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