Hands-on with Claude Fable 5: A relentlessly proactive AI coding assistant
By
Simon Willison
Kettled twice. Extra chewy, extra trustworthy.
Summary
The article describes the author's hands-on experience with Claude Fable 5, an AI coding assistant that is described as "relentlessly proactive." The author illustrates this through a real-world debugging example where they encountered a UI glitch (horizontal scrollbar) in their Datasette Agent project. By simply dragging a screenshot into Claude and giving a brief instruction, the AI proactively analyzed dependencies, identified the root cause, and suggested a fix without needing step-by-step guidance. The article highlights how Claude Fable 5 anticipates needs, takes initiative, and uses various techniques autonomously to solve problems.
Key quotes
· 3 pulledAfter two days of experience with Claude Fable 5 I think the best way to describe it is relentlessly proactive.
It knows a whole lot of tricks and it will deploy pretty much any of them to get to its goal.
I snapped this screenshot... then started a fresh claude session... dragged in the screenshot and told it: 'Look at dependencies to help figure out why there is a ho'
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