Decide between a monthly AI plan and paying per use
A monthly plan (like Claude Pro) gives you a flat price with usage limits. Paying per use through an API costs exactly what you use. Which is cheaper depends on how much your bots run.
What the bot does
- Looks at how often your bots run and roughly how much they read and write.
- Estimates a monthly API bill from the providers' official per-token prices.
- Compares that with the flat monthly plans you're considering.
- Tells you which is cheaper for your usage, and where the limits would bite.
What you end up with
A clear answer for your own usage: stay on a plan, switch to pay-per-use, or mix both.
Copy-paste prompt
Fill in the [brackets]. Then paste it into any tool below.
Help me compare costs. My bots: [list each bot, how often it runs, and roughly how much it reads, e.g. '30 emails a day']. Assume about 4 characters per token. Using these official per-million-token prices: [paste rows from the price table], estimate my monthly API cost for each model. Then compare with these plans: [plan and price]. Show your math.
Tools that can do it today
- chatClaudeFree plan; paid plans add more
- chatChatGPTFree plan; paid plans add more
- chatGeminiFree plan; paid plans add more
Plans and limits change; check each tool's page.
Watch out
- Plans have usage limits. Anthropic says paid plans reset on a rolling five-hour window with weekly limits on top.
- On Claude, when you hit a plan limit you can turn on usage credits billed at standard API rates, and Max plans include $100 to $200 a month in API credits.
- Token counts vary. Anthropic says its newer models' tokenizer makes about 30% more tokens for the same text.
Questions people ask
Which AI tools can do this?
Claude, ChatGPT or Gemini can do this today. Paste the copy-paste prompt on this page into any of them and fill in the [brackets].
How hard is it to set up?
It's rated Easy. Start with the steps under “What the bot does”.
What should I watch out for?
Plans have usage limits. Anthropic says paid plans reset on a rolling five-hour window with weekly limits on top.
Sources
- docsClaude plans and FAQ (official)
- docsAnthropic API pricing (official)
- docsMistral pricing: Pro $14.99/month, plus how API pricing is calculated
Last checked Oct 21, 2026. Self-reported results from posts are the poster's own claims.