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Why does my Claude prompt output change so much between Haiku and Opus?

SU Asked by Susan Burton · 17-09-2026
10 upvotes 254 views 0 comments
The question

I am trying to standardize my writing workflow, but I noticed a huge discrepancy in style when I switch between models. I created a base prompt for technical documentation, and while Opus handles it perfectly with a professional tone, Haiku seems to ignore half the instructions and produces something way too casual. Is there a trick to writing prompts that work consistently across all models, or do I need to maintain separate prompt templates for each version?

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