The prompt that worked fine on GPT-4 fell apart on a smaller open model, here's why
This story is from 2026-08-25. It is preserved in the archive; the latest stories are on the live feed.
Ported a prompt that worked great on a frontier model over to a smaller open model and it just... didn't hold up. Same instructions, same structure, noticeably worse output. Took a while to realize it wasn't really a prompting problem. Frontier models are forgiving of imperfect context, they infer…
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- 2026-08-25 20:46 · r/PromptEngineering
The prompt that worked fine on GPT-4 fell apart on a smaller open model, here's why