Is prompt caching worth enabling? (ROI)
Is it worth it? To decide whether prompt caching is worth enabling, you have to weigh what the AI costs against what it saves or earns. This page helps teams with repeated context put both sides on the same page and see the payback, not just the invoice.
Results update automatically as you type.
- Input cost without cache
- $0.0150
- First request (writes cache)(one-time cache-write premium)
- $0.0180
- Cache-write premium (first hit)
- $0.0138
- Cached request (cache hit)
- $0.00420
- Savings per cached request
- $0.0108
- Savings per month
- $1,620.00
Why this isn't trivial
The part people underestimate: caching only helps when a large context repeats across requests, so the saving scales with how often you reuse the same prompt prefix. In practice the biggest savings come from structuring prompts so the reusable prefix is cacheable, so it is worth modelling before you commit.
How it's calculated
We estimate this by comparing normal input cost with the cached-rate cost on the repeated portion across your request volume. 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
When does caching pay off?+
When a big, identical context is reused many times — like a system prompt or knowledge block.
Is there a downside?+
Minor complexity and cache-write cost; the tool shows if net savings are positive.
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.