Two prompts, 4 hours: Claude Fable 5.5 produces a 9-minute four-movement symphony with video
imjustnewatai · x · 2026-10-11
A user gave Claude Fable 5.5 just two prompts — "write a beautiful symphony" and "record a video of it when you're done." About 4 hours later, the result was a 9:38 symphony in four movements, with video of every note. A striking demo of long-horizon autonomous agent execution.
Related event: Claude Composes 9-Minute Four-Movement Symphony From Just Two Prompts(2 posts)→
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