\[ \boxed { y \left ( x \right ) {\frac {\rm d}{{\rm d}x}}y \left ( x \right ) +y \left ( x \right ) +{x}^{3}=0} \]
Mathematica: cpu = 3.318922 (sec), leaf count = 19 \[ \text {DSolve}\left [x^3+y(x) y'(x)+y(x)=0,y(x),x\right ] \]
Maple: cpu = 1.779 (sec), leaf count = 0 \[ \text {could not solve} \]