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100 words of English is about 145 tokens on GPT-5.6 Terra (122–167), and about 188 on Claude Opus 5. Sending it costs $0.00029; having the model write it costs $0.0017.
Tokens are the pieces AI models read and bill by, and they are not words. Our counter measures characters: English runs at about 4 characters per token on OpenAI’s tokenizer, and the prose on this page averages 5.8 characters per word including the space — so 100 words is about 145 tokens on GPT-5.6 Terra, somewhere between 122 and 167.
The same text is a different number of tokens on each model, and output tokens cost several times more than input. The table below counts 100 words for every popular model and prices both directions. The calculator is set to 145 input tokens on GPT-5.6 Terra — paste your own text or change the model to count it exactly the way your bill will.
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Paste a prompt or a reply above, upload a screenshot, or enter exact token counts in Advanced settings — then this fills with the token count and what it costs.
Drop in a paystub, bank statement or screenshot — the AI reads it and fills these fields for you.
Income & Expense Tracker is where this stops being a one-off number: keep your real balances there and the projection updates itself.
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English prose, one request, no prompt caching. Token counts are estimates with their range; prices are each provider’s published API rates, verified September 9, 2026.
| Model | Tokens | Send as a prompt | Model writes it |
|---|---|---|---|
| GPT-5.6 Sol (OpenAI) | ≈145 (122–167) | $0.00058 | $0.0029 |
| GPT-5.6 Terra (OpenAI) | ≈145 (122–167) | $0.00029 | $0.0017 |
| GPT-5.6 Luna (OpenAI) | ≈145 (122–167) | $0.000029 | $0.00017 |
| Claude Opus 5 (Anthropic) | ≈188 (140–235) | $0.00094 | $0.0047 |
| Claude Sonnet 5 (Anthropic) | ≈188 (140–235) | $0.00038 | $0.0019 |
| Claude Haiku 4.5 (Anthropic) | ≈145 (115–174) | $0.00015 | $0.00072 |
| Gemini 3.1 Pro (Google) | ≈152 (113–190) | $0.0003 | $0.0018 |
| Gemini 3.8 Flash (Google) | ≈152 (113–190) | $0.00011 | $0.00057 |
| Grok 4.6 (xAI) | ≈152 (113–190) | $0.0003 | $0.00091 |
| DeepSeek V4 Pro (DeepSeek) | ≈152 (113–190) | $0.0001 | $0.0003 |
| DeepSeek V4 Flash (DeepSeek) | ≈152 (113–190) | $0.000033 | $0.0001 |
Words of English text