How much does a ChatGPT prompt cost?

A typical ChatGPT prompt costs fractions of a cent: roughly 130 tokens of input is about $0.001 on GPT-4o and $0.0006 on Claude Sonnet. Costs only become visible when you automate, a prompt run 50 times a day on a frontier model can reach $30-60 a month, while the same workload on a fast model like Claude Haiku stays under $5. The prompt cost calculator shows the monthly bill for any prompt on 12 models.

How does the AI prompt cost calculator work?

Paste any prompt, and the calculator estimates its token count with the standard ~4 characters per token heuristic, then multiplies it across the model price list, input tokens at each model’s input rate plus an estimated output at the output rate. Set how many times you run the prompt per day and you get the exact per-run, daily and monthly cost for every model, sorted cheapest first.

How much does a ChatGPT or Claude prompt cost?

A typical 500-token prompt costs a fraction of a cent on most models: roughly $0.0005-0.005 per run on mid-tier models like GPT-4o or Claude Sonnet, and less on cheap models like Claude Haiku or Gemini Flash. Costs become real at volume: a 1,000-token prompt run 100 times a day can reach $30-150 per month on a flagship model.

How accurate is the token estimate?

The ~4 characters per token rule is a widely used heuristic and lands within roughly 10-20% of real tokenizers for typical English text. Code, symbols and non-English scripts can differ more. For exact billing numbers, check the provider dashboard, this calculator is designed for budgeting and model comparison, not invoicing.

Which model is cheapest for running the same prompt?

Fast or open models, Gemini Flash, Llama 4 Maverick, DeepSeek V3 and Claude Haiku, typically cost 10-50x less than frontier models like Claude Opus or GPT-4o-class for the same prompt. The calculator sorts every model by your monthly cost so the best value for your exact prompt is always at the top.

Can I finance my API or AI tool spend with Payle?

Yes. Payle covers approved AI tools, subscriptions and usage-based plans from the AI Store, at exclusive pricing of about 25% below retail, with $0 today and annual plans split over 3 equal monthly installments at 0% APR. Use this calculator to size the bill, then let Payle take the upfront sting out of it.

AI prompt cost calculator.

Ever wonder what that prompt actually costs when you run it 50 times a day? Paste it, pick your frequency, and see every model priced per run, per day and per month with the best value highlighted automatically.

What does your prompt really cost?

Prompt length, how often you run it, and the models, we price every run, day and month.

Free · no sign-up · your numbers never leave the browser

1 · How long is your prompt?

2 · How many runs per day?

3 · Which models do you compare?

Set the values above to see your estimate update live.

How to calculate AI prompt costs

1
Count the tokens in your prompt
Providers bill per token, and a token is roughly 4 characters of English text. A 500-word prompt runs about 700 tokens; a long system prompt with examples can reach 3,000-8,000.
2
Add the output you get back
You pay for output tokens at a different (usually higher) rate. A support reply might be half your prompt length; a 2,000-word analysis can be 3-4x longer than the input.
3
Multiply by your real frequency
Costs hide in repetition. Running a 1,000-token prompt once is trivial; running it 50-100 times a day, every day, turns cents into a real monthly line item.
4
Compare models, not habits
The same prompt costs 10-50x less on Gemini Flash, Llama or Claude Haiku than on Claude Opus or a GPT-4o-class flagship, often with acceptable quality. The calculator sorts them for you.

Why token counting matters

The problemThe answer

Most people never see an AI price tag because a single prompt costs fractions of a cent. But prompts are rarely run once: support replies, content generation, code review and data extraction all loop at scale. At 100 runs a day, a careless prompt on a flagship model quietly costs more than the flat plan that would have covered it.

Output tokens usually cost 2-5x more per token than input

The two levers that actually move the bill are prompt length (context you feed in) and model choice (what you pay per token). Both are visible here in seconds, before the invoice, not after.

Cheap models deliver 80-90% of the value for many tasks

Shorter prompts, cheaper models and honest frequency turn a scary line item into a rounding error. And when your prompt volume is real, Payle covers approved usage at exclusive pricing, $0 today, spread over 3 interest-free months.

At scale, one flat plan or a smarter model beats both

Built by Payle, price exact token mixes with the AI token calculator, estimate your real volume with the AI usage simulator, or find the best annual plans in the AI deal finder.