Claude Fable 5.1 is now available for Custom Agents. It's a step up from Fable 5 across the board, especially for complex knowledge work. Plans and summaries t

Claude Fable 5.1 is now available for Custom Agents. It's a step up from Fable 5 across the board, especially for complex knowledge work. Plans and summaries tend to be more concise, too. [▻](https://video.twimg.com/amplify_video/2094848406187630592/vid/avc1/1264x1080/BwsxwGTK68pRp1M1.mp4)