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Why are some GPT 5 API requests costing three times more than others?

We've been using the GPT 5 API for document processing and noticed that some requests are costing two or three times more than others even when the documents are roughly the same length. At first I assumed it was just the input size but after looking at the usage numbers, that doesn't seem to expla…

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  1. 2026-10-24 14:50 · r/OpenAI
    Why are some GPT 5 API requests costing three times more than others?

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