"Golden Visa", if it is the same thing Mr Thaksin introduced in 2003, does give you 5-10-20 years stay, at the price of 8,000 THB (200 EUR) per month just to breath Thai air. Nothing else worth mentioning.
I know of some Japanese Execs who got that from their companies, part of their retirement package.
Is there such a visa for 90 days? Maybe a tourist visa.
60 days as of now (March 25 2025) and you go to Immigration to get next 30 days extenssion. During that time (after 60 days and extension) you can apply for a Non O, visa.