I think that's by design - they're going to IPO soon so if they can get a significant percentage of users to switch from the $200 to the $500, they can 2.5x projected revenue.
Very risky to do so especially considering how well is opus 5.5.
I am skeptical that individuals on the $200 and $500 plans make up that meaningful of a portion of revenue.
Yeah, that's not going to happen. They are more likely to lose a lot of customers, unless Anthropic does the same thing.
But $200 is likely the ceiling of what people will pay for a subscription with usage based on vibes.