I don't think you will better this beautiful two-CD set from Norway, where we have all of Brahms' chamber music with clarinet.
The clarinet is played by Hans Christian Braein, son of a Norwegian composer and a bit of a hero in Norway, so I read. Anyway he is a wonderful player of these late Brahms works, all of which should be in any comprehensive music collection.
CD one has the two Op 120 sonatas with the clarinet very sympathetically supported. CD encompasses the Trio Op 114 and the lovely Quintet Op 115 in a sublime performance.
Add excellent sonics and good notes, this 2006 release is worth every penny.