Sonnet 5 is a trash model and stupidly expensive if you accidentally set reasoning tokens high - more expensive than fable - it absolutely should not be the default lmao. If the common coding tasks you use ai for is doable with sonnet or local qwen - you're either not using Claude code (if you are, you'll very quickly see that sonnet 5 in Claude code is not a model for "occasional subagent use" - spinning up subagents is the only thing it's good at and it does it way too much. It can spin up subagents and waste huge amounts of tokens but it can't write good code lol.) or you've got Claude code workflow that is very human in the loop where you are significantly steering and controlling the models. And in that case your default should be to use gpt. Claude models are stupid slow.