Free • No signup • Works offline
Token Counter — Count Tokens & Estimate AI API Cost
Last updated: June 1, 2026
Count tokens and estimate API costs for GPT-4o, Claude, Gemini side by side. Optimize your AI prompts to save money.
Characters 0
Tokens 0
Estimated API Cost
Based on 1M token pricing| Model | Input Cost | Output Cost |
|---|
How to use this tool
1
1
Paste your prompt, code, or context document into the text area.
2
2
The token counter will instantly update as you type, accurately calculating tokens via js-tiktoken.
3
3
Check the pricing table below to see exactly how much it would cost to run this text as an input or output across various major LLMs.
Frequently Asked Questions
How many tokens is my prompt?
This offline calculator uses the exact `js-tiktoken` library (the same cl100k_base encoding OpenAI uses) to accurately count your prompt's tokens. For English text, 1 token is roughly 3/4 of a word. You can instantly see the character and token count update as you paste your document.
What is the ChatGPT token limit?
GPT-4o has a context window of 128,000 tokens. Other models vary: Claude 3.5 Sonnet supports up to 200,000 tokens, and Gemini 1.5 Pro supports up to 2 million tokens.
Claude token counter vs OpenAI token counter?
OpenAI uses the cl100k_base byte-pair encoding algorithm (BPE), while Anthropic (Claude) uses a different tokenization strategy. However, as an industry standard, estimating API costs using the OpenAI token algorithm provides a highly accurate baseline for most major LLMs.
How can I reduce OpenAI API costs?
To reduce costs, you should minify JSON payloads, strip unnecessary HTML tags, remove redundant spaces/newlines, and keep instructions concise. Use our Prompt Minifier to automate this process and track your savings.
Tokens vs Words: What's the difference?
Tokens are chunks of text that the AI model processes. A short word like 'apple' is one token, but a complex word like 'hamburger' might be split into three tokens ('ham', 'bur', 'ger').
Is this offline ChatGPT token calculator free to use?
Yes, this tool is completely free, runs 100% locally in your browser, and does not send your prompt text to any external servers. Your intellectual property remains secure.
Ad space — AdSense pending approval