One Endpoint, Many Backends: OpenRouter's Fallback Feature Has a Catch
OpenRouter's automatic fallback routing can send identical requests to different backend providers running different serving software, producing inconsistent outputs for the same model name.
What it is
A writeup by Mohamed Moustafa cataloging problems caused by OpenRouter's marketed ability to auto-fallback and pick the most cost-effective backend for a given model request.
What it does
It documents how different providers behind the same OpenRouter model endpoint run different serving stacks and optimization settings, so two calls to the same model name can behave differently depending on which backend answered.
Why it matters
Teams relying on OpenRouter as a drop-in unified API, instead of a single provider's direct endpoint, may see subtle non-determinism in output quality or format that has nothing to do with the model itself and everything to do with routing.
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