(Figure Presented) Ultrahigh stability (> 1400°C) is found for the highly ordered mesoporous polymers and carbon frameworks synthesized from polymerization of phenol and formaldehyde around triblock copolymer templates. Calcination and carbonization lead to removal of the templates and formation of hexagonal and cubic carbon mesostructures with large uniform pores and surface areas (see schematic diagram). © 2005 Wiley-VCH Verlag GmbH & Co. KGaA.