Karthi's next release was Rajesh M's "All in All Azhagu Raja", which featured him opposite Kajal Aggarwal and Santhanam. The film was released on Diwali 2013, and received mostly negative reviews from critics, with Behindwoods saying: "Though the laughs are spread across a few moments, when "All in All Azhagu Raja" is pitted against Rajesh's other wholesome "laughathons" such as "OK-OK" and "Boss Engira Bhaskaran", it falls way short" and Sify saying "The trouble with All in All Azhagu Raja is that it lacks basic story line and took the audiences for granted. The film has no real script to speak of, at best a skeletal plot." His next film was Venkat Prabhu's "Biriyani", which was released in December 2013, opening to positive reviews and became a box office success. He also sang the song "Mississippi" under Yuvan Shankar Raja's direction for both the Tamil and Telugu versions of the film. In 2014, Karthi appeared in Pa. Ranjith's "Madras", a critical and commercial success. His next release was the 2015 action drama "Komban". His first release in 2016 was the Telugu-Tamil bilingual film "Oopiri". The film received positive reviews. Karthi's performance was also praised, with Baradwaj Rangan of "The Hindu" stating (in his review of the Tamil version "Thozha"), "At a time every leading man (including Karthi) seems to be participating in a game-show titled "Who Wants To Be The Next Rajinikanth?", here's a simple 'buddy movie' (in the Hollywoodian sense), with no punch dialogues, no action sequences, with just one duet (with Tamannaah, who plays Vikram's secretary; her romance with Seenu is strangely unresolved). We see, all the time, character actors striving to become larger-than-life heroes. For a change, here's a hero scaling himself down to play a life-sized character." Later that year, Karthi appeared in director Gokul's "Kaashmora". Though the film received mixed reviews, his performance was praised.