Count tokens, estimate API costs, and visualize tokenization for GPT-4.1, GPT-4o, and other OpenAI models.
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⚡ Instant
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0
$0.000000
$0.000000
$2/1M tokens
$0.000000
$8/1M tokens
Use our tokenizer API with full URL:
We utilize the advanced gpt-tokenizer library with the cl100k_base encoder - the same encoding system used by modern GPT-4 and GPT-3.5 models for maximum accuracy.
Unlike many tools that use outdated encoders, our tokenizer provides precise results that match exactly what OpenAI's latest models process.
Token count directly affects both API costs and model limitations. Each model has maximum token limits, and exceeding these results in errors or truncated responses.
Language significantly impacts tokenization - English typically produces fewer tokens than non-Latin languages. For example, "hello" uses 1 token while equivalent words in other languages may require multiple tokens.
Input: $2.00/1M tokens
Output: $8.00/1M tokens
Input: $0.40/1M tokens
Output: $1.60/1M tokens
Input: $0.100/1M tokens
Output: $0.400/1M tokens
Get instant token counts as you type
Calculate API costs for all models
See tokens with color coding for better understanding
Download tokenization results as JSON
Estimate costs before making API calls and optimize your prompts for efficiency.
Plan your content to stay within model context limits and budget constraints.
Optimize your prompts by understanding token usage patterns and costs.
