I throw all my queries at Grok 4 Expert, GPT 5 Thinking and Opus 4.1 Extended Thinking.. for Golang it's been my experience that Grok produce the best results about 90% of the time as well.
Not sure about Claude, but OpenAI models are pretty bad at Go for some reason. For example, they always want to replace the "new" style for-loop that uses range with the old syntax. This drives me nuts.