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Design LLM Provider Fallback and Routing So Outages Do Not Stop You

AI & Agents advanced 7 min read $0.01 Updated 2026-10-19

Reliable multi-provider LLM design: error classification (retry, fail over, fail fast), timeouts and circuit breakers, equivalent-model mapping, prompt and tool-schema adaptation, consistent output validation, cost and data-policy limits, and testing failover.

One provider outage or rate limit should not take your product down. Classify errors, retry the right ones, fail over to a second model with an adapted prompt, and keep behavior consistent.

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