How Much Does an AI Tutor Cost per Student? (2026)
By Ritesh, founder of Keelwork Studio · Updated
The cost model
| Item | Assumption | Cost |
|---|---|---|
| Input per answer | Up to ~2,000 tokens (one page of notes + question) | ~US$0.0006 |
| Output per answer | Up to 900 tokens | ~US$0.0023 |
| Per answer (worst case) | Small model at US$0.30 / US$2.50 per million tokens | ~US$0.003 |
| Per student per day | Capped at 10 answers | ~US$0.03 |
| Per student per month | Worst case, before caching | under US$1 |
| Whole platform per day | Ceiling of 2,000 answers | ~US$6/day (~US$180/month max) |
These are upper limits from the caps, not measured averages. Real spend is lower because most students don't hit the cap and cached answers are free. Model prices change. Check the current list before you budget.
The three limits that make it predictable
- Shared cache: when one student asks about a page, the next student asking the same thing gets the stored answer instantly, at no cost. When the page changes, the cache refreshes.
- Per-student daily cap: no single user can run up the bill.
- Platform ceiling: a hard daily maximum across all users, with an alert to a human if reached. Exam season can't surprise you.
Two more things to get right
- Answer from your material. Grounding the AI in the page the student is reading keeps answers on your syllabus.
- Check access on the server. Paid AI features must be enforced on the server, never just hidden in the app, and AI keys should never ship inside the app.
Real example
This is the model behind AI Help in BrightMinds, a paid exam-prep app for Classes 7–10 and NDA aspirants. Read the BrightMinds case study.
Questions
How much does an AI tutor cost per student?
Using a small model priced around US$0.30 per million input tokens and US$2.50 per million output tokens, one answer from about 2,000 input and 900 output tokens costs about US$0.003. With a cap of 10 answers per student per day, the worst case is under US$1 per student per month.
How do you stop AI costs from spiking?
Use three limits: a shared cache so repeated questions about the same page are answered for free, a daily cap per student, and a platform-wide daily ceiling that alerts a human.
Which AI model should an education app use?
For explaining and quizzing on a page of study material, small fast models are usually enough and cost a fraction of frontier models. Prices change often, so check the provider's current price list.
Want this worked out for your business?
A 20-minute call with Ritesh. You'll leave with a realistic scope and price range, whether or not you work with us.