955, Understood. However, all of that refers to cloture and filibuster only and does not consider the constitutional option as it is. Cloture's super-majority vote can be obviated as a Senate rule during a Congressional session by employing the constitutional option.
This option is not exercised in one way, but has variations from simple to complex.
The information concerning the constitutional option was provided previously. Here it is again below with additional links for your consideration. The links move from simple to complex explanations.
Conclusion Article I, Section 5 of the U.S. Constitution empowers the Senate to “determine the Rule of its Proceedings.” In 1917 and on many occasions since 1917, the Senate has debated whether this constitutional rulemaking power allows a simple majority to alter the Senate’s Standing Rules at will. At least four times, changes to the Senate Standing Rules were influenced by attempts to use the constitutional option. And throughout Senate history, a simple majority has changed Senate procedures governing debate by setting precedents or adopting Standing Orders that altered the operation of the Standing Rules without amending their actual text. Over two centuries, the Senate’s constitutional rulemaking power has been exercised in a variety of ways to change Senate procedures. As Senate parliamentary process further evolves, this power plainly will be exercised again. At issue is when, how, and to what effect.