I use Claude through OpenRouter (with Aider), and was pretty amazed to see that it routes the requests during the same session almost round-robin through Amazon Bedrock, sometimes through Google Vertex, sometimes through Anthropic themselves, all of course using the same underlying model.

Literally whoever has the cheapest compute.

With the speed that AI models are improving these days, it seems like the 'moat' of a better model is only a few months before it is commoditized and goes to the cheapest provider.