OpenRouter
OpenRouter gives applications one API for models hosted by different providers. It also has a chat interface for comparing responses. Model selection, provider routing, and fallback settings let a developer change the service behind a request without building a separate integration for every provider.
Compare models for a real task
Start with a small set of prompts from your application, such as extracting fields from support messages. Choose the exact model identifier, send the same inputs, and check the returned format and task accuracy. Record input and output token costs as well as errors. Configure a fallback only after checking that the alternate model supports the required inputs and output format.
Free models and billing
Only designated free endpoints have zero model charges. The published limits are 20 requests per minute and 50 per day, increasing to 1,000 per day after at least $10 of credits have been purchased. Capacity and model availability can change. Paid calls deduct model-specific charges from your balance, and purchasing credits carries a platform fee.
Check the endpoint’s data policy
OpenRouter and the downstream provider have separate data practices. Logging, retention, and training policies can differ between endpoints, including free endpoints. Review the provider policy and privacy settings before sending private material. A free model listing does not establish that every endpoint has the same privacy terms.