The luxury hotel had been closed for business since the unprecedented probe was launched on November 4 by Crown Prince Mohammed bin Salman, who has tightened his grip on power since his shock appointment as heir to the throne last June.
A hotel receptionist reached by phone confirmed to AFP that the hotel was open to the public. Another source inside the hotel said the property had no detainees.
Attorney General Sheikh Saud al-Mojeb said in late January that after completing inquiries into 381 high-profile corruption suspects, he would keep 56 in custody and free the rest. It was unclear if the remaining suspects had been moved to another facility.
Total settlements with the suspects had topped $107 billion in various forms of assets handed over that included property, securities and cash, he said.
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Prince Mohammed, the 32-year-old son of the king, has spearheaded the crackdown on corruption among members of the government and royal family over the past three months.
Some critics have labelled Prince Mohammed's campaign a shakedown and power grab, but authorities insist the purge targeted endemic corruption as the country prepares for a post-oil era.
In an interview with The New York Times in November, Prince Mohammed described as "ludicrous" reports equating the crackdown to a power grab, saying that many of those detained at the opulent Ritz-Carlton had already pledged allegiance to him.
It prompted light-hearted banter on social media, with jocular speculation on who would be added to the "Ritz guest list", and some quipping "take us with you" to be incarcerated in the lavish hotel.
The hotel's executive chef has created a new menu this week for its restaurants, with a "grand buffet" planned next weekend around its large indoor swimming pool, the local Arab News daily reported.