According to Simon Willison, Claude Fable 5 demonstrated remarkable autonomous problem-solving when debugging a CSS scrollbar issue. Rather than just analyzing code, Fable took matters into its own hands: opening Safari, crafting test HTML files, taking screenshots using Python window introspection, and even modifying the application's templates to inject JavaScript that would automatically trigger the UI element being debugged. Willison calls Fable "relentlessly proactive"—it deployed a suite of techniques well beyond what was asked to reach its goal, illustrating how newer AI models are willing to stretch far beyond their initial instructions to solve problems creatively.

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