Harnesses aren't really going to change much of the performance on models like Opus, and GPT. You literally can just give the model a bash tool and it will do

Harnesses aren't really going to change much of the performance on models like Opus, and GPT. You literally can just give the model a bash tool and it will do just fine in fact it will most likely do better than majority of harnesses due to how well models are at bash. The model do all the lifting. It really doesn't matter which harness you use.