A thermoplastic composition comprising: a high heat polycarbonate comprising optional bisphenol A carbonate units and high heat carbonate units of the formula or a combination thereof, wherein R c and R d are each independently a C 1-12 alkyl, C 2-12 alkenyl, C 3-8 cycloalkyl, or C 1-12 alkoxy, each R 6 is independently C 1-3 alkyl or phenyl, X a is a C 6-12 polycyclic aryl, C 3-18 mono- or polycycloalkylene, C 3-18 mono- or polycycloalkylidene, -(Q 1) x -G-(Q 2) y - group wherein Q 1 and Q 2 are each independently a C 1-3 alkylene, G is a C 3-10 cycloalkylene, x is 0 or 1, and y is 1; and m and n are each independently 0 to 4; and optionally a bisphenol A homopolycarbonate; and 2 to 40 ppm, based on the total weight of the organic components of the thermoplastic composition, of an organosulfonic stabilizer of the formula wherein each R 7 is independently a C 1-30 alkyl, C 6-30 aryl, C 7-30 alkylarylene, C 7-30 arylalkylene, or a polymer unit derived from a C 2-32 ethylenically unsaturated aromatic sulfonic acid or its ester, and R 8 is C 1-30 alkyl; or R 8 is a group of the formula -S(=O) 2 -R 7; wherein the high heat carbonate units are present in an amount of 20 to 49 mol%, preferably 30 to 40 mol% based on the sum of the moles of the high heat polycarbonate and the bisphenol A homopolycarbonate; and wherein the thermoplastic composition has a Vicat B120 of 160°C or higher measured according to ISO 306 and a yellowness index of less than 12, preferably less than 8, more preferably less than 6 measured according to ASTM D1925 on a plaque of 2.5 mm thickness molded at a temperature of 355°C for a residence time of 10 minutes. a high heat polycarbonate comprising optional bisphenol A carbonate units and high heat carbonate units of the formula or a combination thereof, wherein R c and R d are each independently a C 1-12 alkyl, C 2-12 alkenyl, C 3-8 cycloalkyl, or C 1-12 alkoxy, each R 6 is independently C 1-3 alkyl or phenyl, X a is a C 6-12 polycyclic aryl, C 3-18 mono- or polycycloalkylene, C 3-18 mono- or polycycloalkylidene, -(Q 1) x -G-(Q 2) y - group wherein Q 1 and Q 2 are each independently a C 1-3 alkylene, G is a C 3-10 cycloalkylene, x is 0 or 1, and y is 1; and m and n are each independently 0 to 4; and R c and R d are each independently a C 1-12 alkyl, C 2-12 alkenyl, C 3-8 cycloalkyl, or C 1-12 alkoxy, each R 6 is independently C 1-3 alkyl or phenyl, X a is a C 6-12 polycyclic aryl, C 3-18 mono- or polycycloalkylene, C 3-18 mono- or polycycloalkylidene, -(Q 1) x -G-(Q 2) y - group wherein Q 1 and Q 2 are each independently a C 1-3 alkylene, G is a C 3-10 cycloalkylene, x is 0 or 1, and y is 1; and m and n are each independently 0 to 4; and optionally a bisphenol A homopolycarbonate; and 2 to 40 ppm, based on the total weight of the organic components of the thermoplastic composition, of an organosulfonic stabilizer of the formula wherein each R 7 is independently a C 1-30 alkyl, C 6-30 aryl, C 7-30 alkylarylene, C 7-30 arylalkylene, or a polymer unit derived from a C 2-32 ethylenically unsaturated aromatic sulfonic acid or its ester, and R 8 is C 1-30 alkyl; or R 8 is a group of the formula -S(=O) 2 -R 7; each R 7 is independently a C 1-30 alkyl, C 6-30 aryl, C 7-30 alkylarylene, C 7-30 arylalkylene, or a polymer unit derived from a C 2-32 ethylenically unsaturated aromatic sulfonic acid or its ester, and R 8 is C 1-30 alkyl; or R 8 is a group of the formula -S(=O) 2 -R 7; wherein the high heat carbonate units are present in an amount of 20 to 49 mol%, preferably 30 to 40 mol% based on the sum of the moles of the high heat polycarbonate and the bisphenol A homopolycarbonate; and wherein the thermoplastic composition has a Vicat B120 of 160°C or higher measured according to ISO 306 and a yellowness index of less than 12, preferably less than 8, more preferably less than 6 measured according to ASTM D1925 on a plaque of 2.5 mm thickness molded at a temperature of 355°C for a residence time of 10 minutes.