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A code-heavy field guide to model routing. Real, runnable-style configs for tiering tasks by complexity, routing simple work to open-weights, reserving frontier models for hard reasoning, building failover chains, and keeping prompt caches warm with OpenRouter, LiteLLM, and Factory Router.
OpenRouter Fusion turns multi-model panels into an API feature. The useful lesson is not to run every prompt through more models. It is to define when a task deserves an expensive second opinion.

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