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How to Verify Your LLM API Provider Isn't Swapping Models: A Reproducible Fidelity Test

This story is from 2026-10-28. It is preserved in the archive; the latest stories are on the live feed.

The short answer: you can verify whether an API channel swaps models or degrades quality with three families of reproducible checks — cost-structure checks (prompt-cache behavior cannot be faked economically), behavioral-boundary checks (model families leak their identity at the edges), and blind q…

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  1. 2026-10-28 18:34 · DEV Community — AI
    How to Verify Your LLM API Provider Isn't Swapping Models: A Reproducible Fidelity Test

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