\[ y'(x)=\frac {x^4 \sqrt {4 x^2 y(x)+1}+\frac {1}{2}}{x^3} \] ✓ Mathematica : cpu = 0.184946 (sec), leaf count = 33
\[\left \{\left \{y(x)\to -\frac {2 c_1 x^3}{3}+c_1^2+\frac {x^6}{9}-\frac {1}{4 x^2}\right \}\right \}\]
✓ Maple : cpu = 0.209 (sec), leaf count = 26
\[ \left \{ {\it \_C1}-{\frac {1}{x}\sqrt {4\,{x}^{2}y \left ( x \right ) +1}}+{\frac {2\,{x}^{3}}{3}}=0 \right \} \]