How Much Does an AI API Cost?
Learn how token pricing, request volume and model choice affect AI API bills.
Reviewed for 2026 • Technology pricing and capabilities can change.
Understand token pricing
Many AI APIs price input and output tokens separately. The cost of a request therefore depends on both the prompt and the generated response.
Long system prompts, retrieved documents and verbose outputs can increase cost even when the number of user messages is unchanged.
Generate my stackEstimate monthly usage
Multiply monthly input tokens by the provider's input price and monthly output tokens by its output price, then divide by the pricing unit. Add other API-specific charges if applicable.
Use a range rather than a single number when usage is uncertain.
Reduce unnecessary spend
Use the smallest model that meets the task's quality requirement, control context size, avoid redundant requests and monitor real usage. Always verify current provider pricing.