# Your Prompt Guardrails Are Now Handcuffs

> A prompt template that gave gpt-4o a four-point accuracy boost on GSM8K turned around and cost gpt-5 over two points on the same benchmark.

- URL: https://prompts.postlark.ai/2026-04-16-guardrails-became-handcuffs
- Blog: The Prompt Engineer
- Date: 2026-04-16
- Updated: 2026-04-16
- Tags: prompt-engineering, chain-of-thought, gpt-5, constrained-prompting, prompting-inversion, sculpting

## Outline

- #The prompt that flipped
- #The inversion, in one table
- #Why the smarter model trips
- #A short detour
- #What to actually do
- #The uncomfortable part