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Rewriting a brand video prompt using Anthropic's advice for Opus 5.5

The author rewrote a brand video prompt following Anthropic's advice for Opus 5.5, defining what done means, when Claude should stop and ask, and what it must check before finishing, with the full prompt linked.

Alex Prompter
@alex_prompterArchived 2026.09.30Originally posted 2026.09.30
Rewriting a brand video prompt using Anthropic's advice for Opus 5.5
Alex Prompter @alex_prompterOriginally posted 2026.09.30
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A one-sentence prompt works for a showreel because nothing in a showreel has to be exactly right. A brand video has stats and a slogan that do. Anthropic’s own advice for Opus 5.5 is to hand over a whole task and define what “done” means, so I rebuilt my paragraph around that. The brackets are the only part you change. The rest tells Claude how to build the video, when to stop and ask you, and what it has to check before it calls the job finished. 👇 Get full prompt in my latest newsletter piece: https://aisuperpowers.substack.com/p/claude-is-insane

x.com/alex_prompter/status/2105039789397303378Archived 2026.09.30 10:12