API Pricing
OpenAI API Cost Calculator
Estimate your OpenAI API spend by model, tokens and request volume.
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OpenAI API Pricing Explained
OpenAI charges separately for input tokens (your prompt) and output tokens (the response). One token is roughly 4 characters or ¾ of a word. GPT-4o mini at $0.15/1M input tokens is the most cost-effective for most production apps. Use o1 only when complex reasoning is required, as it costs 100× more than GPT-4o mini.