30x revenues at 17% revenue growth is... aggressive.

Except it's not 100x revenues, and it's not 17% growth. I don't know where you got those numbers from?

The numbers OpenAI gave in the post would mean a 30x multiple pre-money. And the $20B -> $24B run-rate growth since the start of the year could plausibly mean anything from 110% to 200% annualized growth rate, depending on whether that happened over two or three months. The $24B is a lower bound as well, since they only gave use one significant digit for the monthly revenue.