Two prompts, 4 hours: Claude composes a 9-minute four-movement symphony and films it

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 they had a 9:38 symphony in four movements, with a video of every note. A striking showcase of long-horizon autonomous agent execution.

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