What
Claude Code keeps a global configuration file, a file on your computer where it remembers settings and small bits of state between uses. That file now has a new key, savedModelSuccessorShown. It sits in the same list as the keys that record which notifications and announcements you have already seen.
Why
The name and its placement suggest it records whether a notice about a successor to your saved model (a newer model that replaces the one you chose) has been shown to you, so that such a notice is not repeated. How Claude Code actually uses the key is not known.
Names in the bundlesavedModelSuccessorShown
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
It is not clear how or when Claude Code sets or reads this key, or whether any notice is shown to users because of it.