How much does my system prompt cost at scale?
Need to estimate a system prompt's cost at scale? Tokens are the unit AI providers bill in, and getting the count wrong throws off every cost estimate. This page helps teams with long system prompts get an accurate count and the cost that follows from it.
Results update automatically as you type.
- System prompt tokens
- 800 tokens
- Cost per request
- $0.00100
- Cost per month
- $300.00
Why this isn't trivial
The part people underestimate: the system prompt is billed on every single request, so a bloated one quietly taxes your entire volume. In practice the biggest savings come from trimming the system prompt and caching it where supported, so it is worth modelling before you commit.
How it's calculated
We estimate this by multiplying the system prompt's tokens by request volume at the model's input rate. Every figure uses the current provider prices baked into the site (reviewed daily), and you can override any input to match your own assumptions.
Frequently asked questions
Is a long system prompt a problem?+
At scale, yes — it's paid on every request, so trimming it compounds savings.
Can I cache the system prompt?+
Often yes — caching bills the repeated prompt at a lower rate.
Are these prices up to date?+
Yes. The model prices behind this calculator are refreshed and reviewed daily, so your estimate reflects current provider rates rather than a stale snapshot.
Related
Estimates for planning. Pricing data last reviewed 28 July 2026.