You may have seen posts about todays CCSA meeting. Basically they’ve said from October 1st (until March 31st 2023) visa exempt entries will get a stamp for 45 days (up from 30). Visa on arrival, for the counties that pay 2,000 baht on arrival will be 30 days (up from 15).
Although there is no details about extensions it’s widely believed that they will remain unchanged. Visa exempt and tourist entries will still be able to apply for a 30 day extension (edit: for those countries eligible). Visa on arrival is not eligible for extensions.
This has yet to be published in the Royal Gazette so is not yet law but widely expected to be so in the coming days.