This is the exact opposite of my experience.
Claude 4.6 has been excellent with Go, and truly incompetent with Elixir, to the point where I would have serious concerns about choosing Elixir for a new project.
We live in different realities.
Opus and Sonnett practically writes the same idiomatic elixir (phoenix, mind you) code that I would have written myself, with few edits.
It's scary good.
Shouldn't you have concerns picking Claude 4.6 for your next project if it produces subpar elixer code? Cheapy shot perhaps, but I have a feeling exotic languages will remain more exotic longer now that LLM aided development is becoming the norm.