Why can't I access GPT4 (or higher) from the API?

I see others here have acces to the latest GPT-4o, but I am still limited to GPT-3.5 Turbo.

I’ve had a paid GPT and platform account dince September 2023.

What do I need to do to access the newer models via API?

You need to have bought at least $5 worth of credits.