AI Token Counter & Cost Calculator
How to Use the AI Token Counter
Paste your prompt or text into the input field and select your target AI model from the dropdown. The tool supports 19 models from 6 providers: OpenAI (GPT-5.4 family), Anthropic (Claude 4.6/4.5), Google (Gemini 2.5), DeepSeek (V4/V3.2), xAI (Grok 4), and Mistral. It instantly estimates the token count and calculates the approximate API cost for both input and output tokens.
Understanding Tokens and Why They Matter
AI models do not process text as words. Instead, they break text into smaller pieces called tokens using a process known as tokenization. A token might be a whole word like “hello,” a subword like “un” and “likely,” or a single character in some languages. Understanding token counts is essential for two reasons: cost management and context window limits.
Every API call is billed per token. Input tokens (your prompt) and output tokens (the model’s response) are priced separately, with output tokens typically costing 2x to 6x more than input tokens.
Current Model Pricing (April 2026)
| Model | Provider | Input / 1M | Output / 1M | Context |
|---|---|---|---|---|
| GPT-5.4 | OpenAI | $2.50 | $15.00 | 256K |
| GPT-5.4 Mini | OpenAI | $0.75 | $4.50 | 256K |
| GPT-5.4 Nano | OpenAI | $0.20 | $1.25 | 128K |
| Claude Opus 4.6 | Anthropic | $5.00 | $25.00 | 1M |
| Claude Sonnet 4.6 | Anthropic | $3.00 | $15.00 | 1M |
| Claude Haiku 4.5 | Anthropic | $1.00 | $5.00 | 200K |
| Gemini 2.5 Pro | $1.25 | $10.00 | 1M | |
| DeepSeek V4 | DeepSeek | $0.30 | $0.50 | 1M |
| Grok 4 | xAI | $3.00 | $15.00 | 2M |
| Mistral Medium 3 | Mistral | $0.40 | $2.00 | 128K |
Prices change frequently. Check each provider’s pricing page for current rates.
Token Estimation Rules of Thumb
For quick estimates: one token is approximately 4 characters or 0.75 words in English. A typical paragraph of 100 words uses about 130 to 150 tokens. Code tends to be more token-heavy because variable names, symbols, and whitespace all consume tokens.
Choosing the Right Model for Your Budget
Not every task needs the most expensive model. DeepSeek V4 and GPT-5.4 Nano are excellent for simple tasks like classification, formatting, and data extraction at a fraction of the cost. Reserve Claude Opus 4.6 or GPT-5.4 for complex reasoning, creative writing, and multi-step analysis.
The biggest cost saving comes from choosing the right model tier, not from shortening prompts. A task that costs $0.05 on GPT-5.4 might cost $0.004 on GPT-5.4 Nano with similar quality for simple operations.
Optimizing Prompts for Fewer Tokens
Reducing token count directly lowers your API costs. Remove filler words and redundant instructions. Use markdown headers and bullet points instead of verbose prose. Consider whether markdown tables are more efficient than JSON objects for your structured data.
Use the Prompt Formatter to restructure prompts into token-efficient markdown format. For structured output schemas, the JSON Schema Builder generates compact schemas that minimize system prompt tokens.
Privacy and Local Processing
This tool runs entirely in your browser. Your text is never sent to any server, making it safe for confidential prompts, proprietary data, and internal system instructions.
Related Tools
- AI Prompt Formatter — Structure and optimize your prompts before sending
- JSON Schema Builder — Build schemas for AI structured outputs
- AI Output Diff — Compare responses from different models
Frequently Asked Questions
How many tokens is 1000 words?
In English, 1000 words is roughly 1,300 to 1,500 tokens depending on the model and vocabulary. Technical text with code or specialized terminology tends to use more tokens per word than conversational writing.
Do different AI models count tokens differently?
Yes. Each model family uses its own tokenizer. GPT-5.4 uses a different tokenizer than Claude 4.6 or Gemini 2.5. The same text can produce different token counts across models, though the differences are usually small for English text.
Which AI model is the cheapest per token in 2026?
DeepSeek V4 is among the cheapest at $0.30/$0.50 per million input/output tokens. Gemini 2.5 Flash-Lite ($0.10/$0.40) and GPT-5.4 Nano ($0.20/$1.25) are also extremely affordable. Use this tool to compare costs across all 19 supported models.
What is a token in AI and LLMs?
A token is the smallest unit of text that an AI model processes. It can be a whole word, part of a word, or a punctuation mark. Most English words map to one or two tokens, while rare or compound words may split into multiple tokens.