OpenRouter advertises that it "handles fallbacks automatically and picks the most cost-effective option for each request" through a single API endpoint. Mohamed Moustafa documents several problems with this approach: providers run different serving software with varying optimizations and settings, so the same endpoint can behave inconsistently. Some providers lack vision capability for vision models, and reasoning effort processing also differs. Users can restrict routing via the provider.only option, and the /endpoints method lists available providers for a model ID.
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