Working on a series of applications, from rails, nodejs interfacing with twilio's api's to salesforce api's - also C/C++ libraries. The example that stood out the best to me was implementing fiber support in the http library i maintain for ruby. Initially i prompted claude to implement fiber support. It started to write a few thousand lines of code for what codex rightly identified was to use a different IO selector library. The problem did end up being a bit more complex but gpt-5 overall in my experience has better knowledge of what is really available vs claude which not only ends up writing way more code to solve a problem that requires just knowing the libraries better... all of this is super subjective but my main reason for saying - "I have no loyalty to any AI, just the solution"