\[ -x^4+x^3 y'(x)-y(x)^2=0 \] ✓ Mathematica : cpu = 0.0230476 (sec), leaf count = 22
\[\left \{\left \{y(x)\to \frac {x^2 \left (c_1+\log (x)-1\right )}{c_1+\log (x)}\right \}\right \}\]
✓ Maple : cpu = 0.018 (sec), leaf count = 23
\[ \left \{ y \left ( x \right ) ={\frac { \left ( \ln \left ( x \right ) -{\it \_C1}-1 \right ) {x}^{2}}{\ln \left ( x \right ) -{\it \_C1}}} \right \} \]