AI Token Counter & Tokenizer
Count tokens across OpenAI, Claude, Gemini, and DeepSeek models. Paste your prompts and see exactly how much each one will cost before you send it.
Prompt Counter
Check your prompt's token count and estimated costs instantly for any AI model.
Models
Compare token counts across models.
Why Token Counting Matters
Every time you send a prompt to OpenAI, Claude, Gemini, or DeepSeek, you pay for tokens, not characters or words. A single prompt can use hundreds or thousands of tokens depending on how it's structured. Different AI models count tokens differently too. If you're building with AI APIs or trying to stay under your monthly budget, you need to know exactly what you're spending before you hit send. Our token cost calculator estimates the cost for each model instantly, so there are no surprises when the bill comes.
Token costs vary wildly between models. OpenAI's GPT-5.1 charges $1.25 per million input tokens and $10 per million output tokens. Claude Opus 4.5 runs $5 per million input tokens and $25 per million output tokens. Gemini 2.5 Pro starts at $1.25 per million tokens for smaller prompts but jumps to $2.50 for prompts over 200K tokens. DeepSeek comes in cheaper at $0.28 per million input tokens. When you're running hundreds or thousands of API calls, these differences add up fast.
Context limits matter too. Most models max out between 128K and 200K tokens. Go over that limit and your prompt gets rejected. Our tokenizer lets you check token counts and estimated costs across all major AI models in real-time. Paste your prompt, pick your model, and see exactly how many tokens you're using. It's free and works instantly.
Frequently Asked Questions
Tokens are chunks of text that AI models use to process language. They're not the same as words. A token can be a whole word, part of a word, or punctuation. "Happy" is one token, but "unexpectedly" might split into two or three.
No. Tokens are usually smaller than words. A rough rule is 1 token equals about 0.75 words in English. "Hello world" is 2 words but 2 tokens. "Artificial intelligence" is 2 words but could be 3-4 tokens depending on the model.
Each provider uses its own tokenizer with different splitting rules. OpenAI might count 15 tokens for a sentence while Claude counts 17 for the same text. Always check counts for your specific model.
Input tokens are what you send to the model. Output tokens are what the model generates back. Most providers charge different rates for each. For example, OpenAI charges $1.25 per million input tokens but $10 per million output tokens.
OpenAI GPT-5.1 costs $1.25 per million input tokens. Claude Opus 4.5 runs $5 input and $25 output per million. Gemini 2.5 Pro charges $1.25-$2.50 per million. DeepSeek is cheapest at $0.28 per million input tokens.
Our token cost calculator uses current pricing from each provider's official documentation. Costs are estimates based on standard input/output rates. Actual costs may vary slightly if you use cached tokens or special pricing tiers.
Most models support 128K to 200K tokens. Claude Sonnet 4.5 and Gemini 2.5 Pro handle 200K tokens. OpenAI and DeepSeek max out at 128K tokens. Exceeding these limits causes your API call to fail.
Remove filler words and be direct. Cut phrases like "please" and "I would like you to." Use abbreviations where appropriate. Test prompts with our tokenizer to find where you can trim before sending to the API.
Yes. Spaces often bundle with the following word. Punctuation can be its own token or attach to nearby words. Multiple spaces or special characters sometimes use more tokens than expected.
Your API request fails immediately. You won't be charged, but you won't get a response either. Shorten your prompt or split it into smaller requests. Check your count with our tokenizer first.