\[ y'(x)=\frac {1}{2} x^2 \left (2 \sqrt {x^3-6 y(x)}+1\right ) \] ✓ Mathematica : cpu = 0.0895143 (sec), leaf count = 31
\[\left \{\left \{y(x)\to \frac {1}{6} \left (\left (1-12 c_1\right ) x^3-36 c_1^2-x^6\right )\right \}\right \}\]
✓ Maple : cpu = 0.226 (sec), leaf count = 23
\[ \left \{ {\it \_C1}-{x}^{3}-{\frac {1}{2}}-\sqrt {{x}^{3}-6\,y \left ( x \right ) }=0 \right \} \]