But LLMs already do that with text, don't they? And I don't really want to interact with the code directly, so I'm not sure why I should care what language is u

But LLMs already do that with text, don't they? And I don't really want to interact with the code directly, so I'm not sure why I should care what language is used other than raw performance and LLMs ability to use it. Do you have benchmarks on non-trivial tasks (say, generating zstd) that show it does any better than rust?