Paste any text to instantly see token count, word count, and estimated API costs for GPT-4o, Claude 3.5 Sonnet, and Gemini 1.5 Pro.
* ~4 chars/token heuristic. Published API pricing per 1M tokens.
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What is a token? Tokens are the basic units AI language models use to process text. A token can be a word, part of a word, or a single character. On average, 1 token equals roughly 4 characters or 0.75 words in English.
Why do tokens matter? AI APIs charge based on token usage. Understanding your token count helps you estimate costs, stay within context window limits, and optimize prompts for efficiency.
Context windows explained: Each AI model has a maximum context window — the total tokens it can process per conversation. GPT-4o supports 128K tokens, Claude 3.5 Sonnet 200K, and Gemini 1.5 Pro leads with a massive 2M token window.
Reduce token usage: Be concise, avoid repetition, use bullet points, and leverage system prompts to set context once rather than repeating in every message.
See token, word, and character counts update instantly as you type or paste.
Compare estimated costs across 3 major AI models side by side.
Visual progress bars show how much of each model's context window you're using.