IMO, rust. Not because it is concise but because you won't need to spend tokens debugging segfaults and a whole spectrum of bugs that the compiler catches. LLMs usually write tests in the same source files so most features are implemented and working in one shot.
The main problem with those languages is that they were difficult to write and read for people (their learning curve was steeper); but once that coding doesn't matter with LLMs, they will allow for better control of "automated verification" of the Engineering decisions that system builders do.
I compare it to say the blueprints of houses that Civic Engineers and Architects do, with plumbing lines, electiricy lines, calculations for material tensions, supports, etc. We will enter an era of real "Engineering" in Software which Compliled/Statically-Typed languages will better allow.