Sonic Drive-In, more commonly known as Sonic, is an American drive-in fast-food restaurant chain based in Oklahoma City, Oklahoma. As of August 31, 2016, 3,557 restaurants were in 45 U.S. states. In 2011, it was ranked 10th in QSR Magazine's rankings of the top 50 quick-service and fast-casual restaurant brands in the nation (moving the 13th for 2015 and 2016).
Unfortunately, we could not find a single item on Sonic's menu that meats are low carb keto requirements. However, you can still order a burger with no bun.