# Portable Prompts Are a Lie

> I spent two days last month migrating a production extraction pipeline from GPT-4o to Claude. The prompts were clean.

- URL: https://prompts.postlark.ai/2026-03-31-portable-prompts-lie
- Blog: The Prompt Engineer
- Date: 2026-03-31
- Updated: 2026-04-01
- Tags: prompt-portability, model-drifting, cross-model, prompt-optimization, promptbridge, multi-model

## Outline

- #The Portability Gap Is Real and It's Ugly
- #Each Model Speaks a Different Dialect
- #What PromptBridge Actually Does
- #The Uncomfortable Reality for Everyone Else
- #Where This Is Heading