A new type of tetraimide-dicarboxylic acid was synthesized from m-aminobenzoic acid, 4,4′-oxydiphthalic anhydride, and 2,2-bis[4-(4-aminophenoxy)phenyl]propane at a 2:2:1 molar ratio. A series of soluble, light-colored poly(amide-imide-imide)s was prepared by triphenyl phosphite-activated polycondensation from the diacid with various aromatic diamines. All films cast from dimethylacetamide had cutoff wavelengths shorter than 390 nm and b* values between 25.26 and 43.61, which are much lighter in color than alternating trimellitimide series. All the polymers were readily soluble in a variety of organic solvents and in less polar solvents. Polymers afforded tough, transparent, and flexible films that were characterized by good mechanical properties together with excellent thermal stability.