@__ghostfail They added Sonnet 5.5 to the list of model deprecation/retirement dates and didn't touch Sonnet 4.5, which is *still* listed as “active” despite its retirement date being “no earlier than [tomorrow]”!
cited on: claude-sonnet-5-5
Reproduced against link rot, credited and linked to its original. Yours and you’d rather it weren’t here? Open an issue.