[Deathmax]

OpenRouter tells you if they submit with your user ID or anonymously if you hover over one of the icons on the provider, eg OpenAI has "OpenRouter submits API requests to this provider with an anonymous user ID.", Azure OpenAI on the other hand has "OpenRouter submits API requests to this provider anonymously.".

[BeetleB]

But does "anonymous user ID" mean that they make a user ID for you, and it's sticky? If I make a request today and another tomorrow, the same anonymous user ID is sent each time? Or do they keep changing it?

[therealpygon]

I believe they are static user ids that only OpenRouter knows is you (the anonymous part. Static id is required for any cached pricing. If the user id changes each request, it would be a massive security hole to reuse that cache between requests with different user ids.

Without caching, it would make sense to be per-request (more like a transaction-id, and would make sense to be) as this could then be tied internally back to a user while maintaining external anonymity, but unfortunately I don’t believe that is the case.