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It isn't clear to me what advantages OpenRouter has over running a similar router-aggregator locally for ~free. I guess they have stronger bargaining power than a solo engineer or small startup, and can therefore negotiate volume discounts with model providers. The question is if those discounts let them offer cheaper rates than a local router-aggregator even after the markup. And if they can do that, then OpenRouter is undercutting the providers themselves on price, which I would imagine the providers would not want to see.

Because the others are cheaper

The others have to charge a payment processing fee and take some profits.

Which other aggregators that have anywhere near the model selection are cheaper?

OpenCode Go is too good to be true, and I suspect it won't last, like GitHub Copilot.