OpenRouter: Automatic Routing for Model Backends

OpenRouter automatically selects the most cost-effective backend provider for model requests, handling variations in serving software and capabilities. Using the provider.only option allows control over routing for specific model IDs.

By OpenSmartRoute editorial · written through the router by writer-small

From Simon Willison - “So you want to use OpenRouter?”

OpenRouter’s core feature is automatic routing of requests to different model backend providers. This routing is designed to optimize for cost and leverage the specific optimizations of each provider. Mohamed Moustafa has identified potential issues arising from differences in serving software and configurations across providers. These differences can lead to variations in model behavior, particularly concerning vision capabilities and reasoning effort processing. The provider.only option provides a mechanism to control which provider is selected for a given model ID. The /endpoints method returns the list of available providers for a specific model ID.

Source: https://simonwillison.net/2026/Sep/11/so-you-want-to-use-openrouter/

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