Anthropic's Opus 5.5 prompting guide shows why prompts need continual re-optimization
dbreunig · x · 2026-09-23
dbreunig argues Anthropic's prompting guidance for Opus 5.5 is a prime example of designing systems that can be continually re-compiled with prompt optimization: tricks that worked on Opus 4 or GPT-4o are either unnecessary or clash with Opus 5.5's training. Takeaway: prompts aren't write-once — re-optimize per model generation.
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