LLM Token Counter & API Cost Calculator
Calculate exact token consumption and estimate real-time API invocation costs across OpenAI GPT-4o, Claude 3.5 Sonnet, Gemini 1.5 Pro, and open-weight models. 100% client-side & private.
Multi-Model API Cost & Token Matrix
Comparison based on current prompt length and your estimated completion output.
| Model | Est. Prompt Tokens | Input Cost (1 Call) | Output Cost (1 Call) | Total Cost (1 Call) | Batch Total (1,000 Calls) |
|---|
Token Chunk Visualization
Visualizing estimated BPE token sub-wordsWhat is an LLM Token?
Large Language Models (like OpenAI GPT-4o, Anthropic Claude, and Google Gemini) do not read text in words or characters. They process text broken into tokens—pieces of words, punctuation, and spaces typically averaging 4 characters or ~0.75 words in English.
Input vs Output Pricing
LLM API providers charge separately for input tokens (the prompt you send) and output tokens (the generated response). Output tokens are typically 3x to 5x more expensive because generation requires autoregressive sequential GPU computation.
100% Private & Browser-Based
Your prompts and proprietary documents never leave your browser. Token estimation and pricing arithmetic run entirely client-side using JavaScript, keeping sensitive code, API keys, and contracts completely confidential.