Non O 90 days from Thai Embassy Australia. Then if you can meet financial requirements you can get another year and keep getting year after year if you keep meet the requirements
Note: After the first 90 days and on extension of stay to leave and come back you need to buy a multiple entry permit.
Put simple this says you can apply for a NEW multiple entry visa. It does not say you can change the visa or extension your on. If your on Non O or extension you can Apply for NEW Non OA multiple entry visa which overrides the Non O. To make it clear the OA must be applied for in your home country.