How does that math work out? The developments during the last year has been... Abysmal? The hype and marketing bull is increasing exponentially though.
(I can't find the original 3.5 API prices even on archive.org, only the Davinci etc. prices, the Davinci model prices were also $20/million).
There's also the observation that computers continue to get more power efficient — it's not as fast as Moore's Law was, doubling every 2.6 years, or a thousand-fold every 26 years, or about 30% per year.
At the current pace of development, AI will catch-up in a decade or less.