Other models locked

Leo shows couple of other models in menu, including a bigger llama, but marked with a lock. Would like to switch when the current one hallucinate, but it didn’t work (no surprise). Is there anything I need to do to unlock, or is it only for internal folks, and I supposed only to wait and hope?
Version 1.61.18 Chromium: 118.0.5993.70 (Official Build) nightly (64-bit)

Oh, there’s go premium button now, which represents the same lock. And then you bump into Stripe…

It’s hilarious that you can’t buy even a Brave Account plan with BAT (or any other crypto).