The first supercomputer is a matter of debate among historians and computer scientists, as the term "supercomputer" was not widely used until the 1970s and 1980s. However, there were several computers built in the 1950s and 1960s that were considered to be among the first supercomputers.
One of the earliest supercomputers was the Control Data Corporation (CDC) 6600, which was built in 1964. It was a vector-processing computer that was designed for scientific and engineering applications, and it had a processing speed of 10 megaflops (million floating-point operations per second).
Another early supercomputer was the IBM System/360 Model 95, which was built in 1967. It was a mainframe computer that was designed for business and scientific applications, and it had a processing speed of 1.5 megaflops.