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Silent HTTP 200 Bugs Can Triple Cloud Costs Without Triggering Any Alerts

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A class of software bugs causes systems to function normally and return successful HTTP 200 responses while silently inflating cloud infrastructure costs. A real-world example occurred on July 13, 2026, when a liteLLM prompt cache invalidation issue caused prefix-based caching to stop working after message ordering in request payloads was changed. Because all outputs remained correct and latency was unchanged, no monitoring systems flagged the problem, and the full token cost was charged on every API call. Traditional engineering tests focus on output correctness rather than cost efficiency, meaning expense regressions often surface only in monthly finance reports rather than in automated build failures. Experts argue that cost metrics like cache hit rates should be treated as hard engineering constraints, capable of failing a pull request, rather than as optional accounting considerations.

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