C# is one of the best languages we evaluated for LLM problem solving. In fact, many strongly typed, lower level languages perform well in our testing (this isn't to say that the solutions are more maintainable, but the LLMs come up with better ideas when writing C# or Rust than Python). Google models especially, for whatever reason, outperform in C#, not Golang.
Data at https://gertlabs.com/rankings?provider=google