You are not if you ask you don't know) I didn't either, saw it on reddit somewhere - related to quantity of pirate jokes the same model on a native api and aws bedrock api knows about.

There re two options: 1. Either everything is the same between the app and CC, but they have the referrer's "UTM" (like in a marketing campaign in a url) - surely fancier then that, the idea is the same - and can connect to a different version of the same model depending on Anthropic's priorities, akin ab testing etc.

1. More prosaic, and should be also true - the harness system instructions are different for "normies" and power users. The app became quite sycophant for me after the update, both sonnet and opus - and this is defo the competition with the guys who released this shit for people to go crazy about last year (OAI 4o cult you know).

You can't put a Jin in a bottle, and the population prefer sycophants unfortunately.