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The Third Price: I Measured Prompt Caching Across 393 LLMs and Found a 90% Discount Hiding Behind One JSON Field

This story is from 2026-08-25. It is preserved in the archive; the latest stories are on the live feed.

Same model. Same prompt. Ten minutes apart. $0.00464 per request $0.00069 per request The difference was one JSON field. I spent last week measuring what LLM requests actually cost, expecting to write about tokenizer differences. I found something more useful instead. Every cost comparison uses two…

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  1. 2026-08-25 16:28 · DEV Community — Machine Learning
    The Third Price: I Measured Prompt Caching Across 393 LLMs and Found a 90% Discount Hiding Behind One JSON Field

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