The last generation, produced from 1957, was the Yak-12A. It was an aerodynamically refined variant, with a slimmer fuselage and a new wing. The cowling was smaller diameter. The rectangular wings were fitted with trapezoidal ends and automatic slats, also single struts replaced twin struts. Navigation equipment and controls were improved, and performance also increased. In the USSR, 3,801 of Yak-12s were built in all models (including 3,013 Yak-12R, M and A). An experimental Yak-12B biplane was also developed, but did not enter production.