Simon Willison 9/11/2026

So you want to use OpenRouter?

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OpenRouter promises automatic fallbacks and cost-effective routing via a single API endpoint, but Mohamed Moustafa highlights pitfalls: different backend providers run varied serving software, optimizations, and settings, causing inconsistent behavior for the same model. Some providers lack vision support for vision models, and reasoning effort handling differs. The article explains how to use the provider.only option to control routing and the /endpoints method to list available providers for a model ID.

So you want to use OpenRouter?

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