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AI Gateways Flag Faulty LLM Responses as Success, Experts Warn

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Popular LLM gateway tools such as LiteLLM, Portkey, and OpenRouter validate AI responses only at the transport level, checking HTTP status codes, response time, and token usage. A response returning HTTP 200 with well-formed JSON is marked as a successful failover, even if the content is hallucinated, incomplete, or contradictory. This means downstream applications can silently process bad data while monitoring dashboards show no errors. Developers are being advised to add a contract validation layer after failover events to check required fields, field types, and forbidden content patterns. Such a validation step reportedly adds only around 45 microseconds of overhead at the 50th percentile, making it a low-cost safeguard for production AI pipelines.

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AI Gateways Flag Faulty LLM Responses as Success, Experts Warn · ShortSingh