AI Cost per Active User: 2026 Benchmarks by Product Type
What a chatbot, a copilot, and an agent actually cost per user per month — and where to cut without hurting retention.
Every founder asks the same question in month 3: "Is our AI feature actually profitable?" Here are the numbers we see across the products we build and audit.
Rough monthly cost per active user
- Simple chatbot (support FAQ): $0.20–$0.80
- In-app copilot (writing, code, spreadsheets): $2–$9
- Vertical agent (sales, ops, recruiting): $8–$35
- Voice agent: $12–$60
- Vision-heavy app: $6–$40
Where the cost actually lives
- Long system prompts sent on every call (fix: prompt caching).
- Retrieval over-fetching (fix: hybrid + rerank, top-5 not top-30).
- No semantic cache (fix: cache the top 10% of repeated queries).
- Agents that loop when they should stop (fix: max-step and self-check budgets).
The 20% rule
If your top decile of users costs more than 20% of their price, you have a pricing problem, not a model problem. Introduce usage caps or a higher tier before you cut quality.
How to get to a real number
Log every call with user id, feature id, prompt tokens, completion tokens, and provider. Roll up weekly. Anyone who cannot show you this table is guessing.
FAQ
Frequently asked questions
What margin should I target?+
70%+ gross margin on AI features. Below 50% and you are running a services business dressed as SaaS.
When should I switch to a cheaper model?+
When evals stay flat within your golden set. Never based on vibes.
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