The OK-GLI completed 25 test flights between 1985 and 1988 before being retired. The OK-GLI was powered by four AL-31 jet engines with the fuel tank in the cargo bay. The highest altitude it achieved was 6000 meters or 19,000 ft. It never reached space.
A sister ship in the Buran program, the Buran Spacecraft did reach orbit and completed two unmanned Earth orbits. It was the only orbital flight in the Buran program.