\[ y'(x)=\frac {1}{4} x \left (-4 e^{-x^2} x^2 y(x)-4 e^{-x^2} x^2+4 e^{-x^2}+e^{-2 x^2} x^4+4 y(x)^2\right ) \] ✓ Mathematica : cpu = 0.0511664 (sec), leaf count = 32
\[\left \{\left \{y(x)\to \frac {1}{c_1-\frac {x^2}{2}}+\frac {1}{2} e^{-x^2} x^2\right \}\right \}\]
✓ Maple : cpu = 0.129 (sec), leaf count = 25
\[ \left \{ y \left ( x \right ) ={\frac {{x}^{2}{{\rm e}^{-{x}^{2}}}}{2}}+ \left ( {\it \_C1}-{\frac {{x}^{2}}{2}} \right ) ^{-1} \right \} \]