The numbers come from the tryai.dev link:

  How much does Grok 4.5 cost on TryAI?
  Grok 4.5 is Input: $0.02 / 1M tokens, Output: $0.06 / 1M tokens. There is no subscription — you pay only for what you use.

Those numbers are incorrect unless they got a deal that's 100x cheaper than API pricing which is unlikely. They updated the original post with the correct costs.

Slop pricing pages? https://www.tryai.dev/models/claude-fable-5 says Fable costs $0.1/$0.5. Can't wait to use it at those prices!

(edit: these have been fixed shortly after)