Why are the plans and pricing for all these products so complicated.

I don't know where I need to sign up to try it out. What is pricing? Is it API or subscription, what?

I had the exact same experience with Grok 4.5 as well.

Nearly every model can be found on OpenRouter and used with a single key. Meta Spark is not among them, but Grok and almost every other model is. That's how I try models I don't already have an account for.