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So you want to use OpenRouter?
Simon Willison highlights OpenRouter pitfalls: provider routing makes the same model endpoint behave inconsistently across backends.
Simon Willison discusses problems, raised by Mohamed Moustafa, with relying on OpenRouter's single API endpoint that automatically routes to the most cost-effective provider. Different backend providers run different serving software with different optimizations and settings, so requests to the same endpoint can behave in different ways. Some providers lack vision capability for vision models, and the reasoning effort option can be processed differently across providers.
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