How much will the OpenAI API cost me per month?
Want to estimate a monthly OpenAI API bill? This page prices that provider for your exact workload using today's rates. It is built for teams building on OpenAI who have picked (or are considering) this provider and need the monthly number, not a marketing page.
Results update automatically as you type.
- Input cost
- $0.00250
- Output cost
- $0.00500
- Per request
- $0.00750
- Per day
- $7.50
- Per month
- $225.00
Why this isn't trivial
The part people underestimate: OpenAI charges separately for input and output tokens per model, so your token mix and model choice set the bill. In practice the biggest savings come from picking the right model tier and using cached input where possible, so it is worth modelling before you commit.
How it's calculated
We estimate this by applying OpenAI's per-model input and output rates to your token sizes and monthly 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
Which OpenAI model is cheapest?+
The mini/nano tiers per token, but match the model to the task — a cheap model that fails costs more in retries.
Does cached input help?+
Yes — repeated context billed at the cached rate can cut input cost significantly.
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.