Okla. Stat. tit. 11 § 9-107
The council shall elect from among its members a president of the city council. The council president shall be elected in each odd-numbered year at the first council meeting held after council terms begin, or as soon thereafter as practicable, and he shall serve until his successor has been elected and qualified. The council president shall act as mayor during the absence, disability or suspension of the mayor. He shall preside at all meetings of the council in the absence of the mayor and while presiding in the place of the mayor, he shall have all the powers, rights, privileges and duties as other members of the council. In the absence of the mayor and the council president, the council shall elect from among its members an acting president of the city council to occupy the position temporarily.
Okla. Stat. tit. 11, § 9-107