Reasoning: Claude Fable 5.2 overtook Claude Opus 5.5
Nov 12, 2026
Humanity's Last Exam 74.3%.
The previous leader was Claude Opus 5.5. Claude app, Pro plan ($20/month) or higher, choose Claude Fable 5.2.
WhichAI.todayWhichAI.todayNov 12, 2026
Humanity's Last Exam 74.3%.
The previous leader was Claude Opus 5.5. Claude app, Pro plan ($20/month) or higher, choose Claude Fable 5.2.