The same guy found Sympy was similarly far behind in differential equations (although Maple edges out Mathematica here): https://www.12000.org/my_notes/CAS_ode

The same guy found Sympy was similarly far behind in differential equations (although Maple edges out Mathematica here): https://www.12000.org/my_notes/CAS_ode_tests/index.htm https://www.12000.org/my_notes/CAS_ode_tests/index.htm He does a few other side-by-side comparisons but doesn't include open source engines in them.