OpenAI API Cost: Estimate Your GPT Bill
OpenAI's lineup spans cheap small models to premium reasoning ones, so your bill depends heavily on which you pick and how much you send. This guide helps you estimate it before you commit.
Pick the right model tier
Small models handle most routine work at a fraction of flagship prices. Reserve the top models for tasks that genuinely need them, and you often cut the bill dramatically without users noticing.
Use caching and batch where you can
OpenAI offers cached-input pricing for repeated context and a discounted batch API for asynchronous jobs. Layering both onto a right-sized model is usually the cheapest way to run at scale.
Calculators for this topic
Frequently asked questions
How do I estimate my OpenAI bill?+
Multiply input and output tokens per request by the model's rates and your request volume — the OpenAI cost calculator does this for you.
How can I reduce OpenAI costs?+
Use a smaller model where possible, cache repeated context, and batch latency-tolerant jobs.