Okla. Stat. tit. 20, § 1

Number of justices - Terms of office. The Supreme Court shall consist of nine (9) Justices. Each Justice in office on July 1, 2020, shall serve the term for which the Justice was appointed or retained in office by retention ballot and until his or her successor is appointed and qualified, unless the Justice vacates the office prior to the end of his or her term or is removed from office as provided by law. Any Justice in office on July 1, 2020, shall be eligible for retention in the same office for succeeding terms.