\[ y'(x)=\frac {x \left (2 x^2 y(x)-2 x^4-x^2+1\right )}{y(x)-x^2} \] ✓ Mathematica : cpu = 0.0235595 (sec), leaf count = 32
\[\left \{\left \{y(x)\to x^2+\frac {1}{2} \left (1+W\left (-e^{x^4-2 x^2-1+c_1}\right )\right )\right \}\right \}\] ✓ Maple : cpu = 0.226 (sec), leaf count = 27
\[ \left \{ y \left ( x \right ) ={x}^{2}+{\frac {1}{2}{\it lambertW} \left ( -2\,{\frac {{{\rm e}^{{x}^{4}}}{\it \_C1}\,{{\rm e}^{-1}}}{ \left ( {{\rm e}^{{x}^{2}}} \right ) ^{2}}} \right ) }+{\frac {1}{2}} \right \} \]