1000 tokens is roughly 750 English words. Each time you call the API, you are charged for your Input tokens and your Output tokens. So if your prompt had 1000 tokens on the Input and 300 tokens on the output, you are charged for 1300 tokens. Pricing varies by model, so check the Pricing page for the latest. So in this example, for gpt-3.5-turbo this is $0.0026.
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