Usage and Grammar
Q. Does Chicago Manual of Style approve of different than? Ugh, frankly.
A. Yes, sometimes. Different than may be used when different from is not an option. Please see CMOS 5.191, s.v. different. You can read more about this in Merriam-Webster’s 11th Collegiate Dictionary: “Numerous commentators have condemned different than in spite of its use since the 17th century by many of the best-known names in English literature. It is nevertheless standard and is even recommended in many handbooks when followed by a clause, because insisting on from in such instances often produces clumsy or wordy formulations. Different from, the generally safe choice, is more common especially when followed by a noun or pronoun.”