I program mostly in Clojure and I expected it to be near the top, as it tends to be very concise and expressive (qualities I really admire). I am getting excellent results from Claude Code (Opus 4.5), and I think this might be one of the reasons. I'm using Claude with a large code base and the token-efficiency of Clojure might help with fitting more into the context window.
I would assume for certain problems LLMs have a solution readily available for JavaScript/ TypeScript or similarly popular languages but not for Clojure/Script. Therefore my thinking was that the process of getting to a workable solution would be longer and more expensive in terms of tokens. I however don't have any relevant data on this so I may just be wrong.