Beh effettivamente ho una versione un po' datata:

wxMaxima 0.6.5 http://wxmaxima.sourceforge.net
Maxima 5.9.3 http://maxima.sourceforge.net
Using Lisp GNU Common Lisp (GCL) GCL 2.6.7 (aka GCL)
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
This is a development version of Maxima. The function bug_report()
provides bug reporting information.
(%i1) 2^400;
(%o1) 258224987808690858965591917200[61 digits]280137831435903171972747493376

provo ad aggiornarla.