\[ y'(x)=\frac {1}{2} i x^2 \left (-2 \sqrt {6 y(x)-x^3}+i\right ) \] ✓ Mathematica : cpu = 0.196218 (sec), leaf count = 76
\[\text {Solve}\left [-y(x)+\frac {1}{12} \left (2 i \sqrt {6 y(x)-x^3}-\log \left (-x^3+6 y(x)+1\right )-2 i \tan ^{-1}\left (\sqrt {6 y(x)-x^3}\right )-2 x^3+12 y(x)\right )=c_1,y(x)\right ]\]
✓ Maple : cpu = 0.227 (sec), leaf count = 55
\[ \left \{ -2\,i\sqrt {-{x}^{3}+6\,y \left ( x \right ) }+2\,i\arctan \left ( \sqrt {-{x}^{3}+6\,y \left ( x \right ) } \right ) +\ln \left ( -{x}^{3}+6\,y \left ( x \right ) +1 \right ) +2\,{x}^{3}-{\it \_C1}=0 \right \} \]