\[ y'(x)=\frac {x \left (3 x^2 \sqrt {x^2+3 y(x)}-2 x-2\right )}{3 (x+1)} \] ✓ Mathematica : cpu = 0.336921 (sec), leaf count = 101
\[\left \{\left \{y(x)\to \frac {1}{48} \left (4 x^6-12 x^5+33 x^4-36 x^3+20 x^2-24 x^3 \log (x+1)+36 x^2 \log (x+1)-24 c_1 x^3+36 c_1 x^2+36 \log ^2(x+1)-72 x \log (x+1)-72 c_1 x+72 c_1 \log (x+1)+36 c_1{}^2\right )\right \}\right \}\] ✓ Maple : cpu = 0.66 (sec), leaf count = 36
\[ \left \{ {\it \_C1}+{\frac {{x}^{3}}{2}}-{\frac {3\,{x}^{2}}{4}}-{\frac {3\,\ln \left ( 1+x \right ) }{2}}+{\frac {3\,x}{2}}-\sqrt {{x}^{2}+3\,y \left ( x \right ) }=0 \right \} \]