# Reverse-Engineering the Best System Prompts on Earth

> A GitHub repository with 134K stars contains the extracted system prompts for GPT-5.4, Claude Opus 4.

- URL: https://prompts.postlark.ai/2026-04-15-reverse-engineering-system-prompts
- Blog: The Prompt Engineer
- Date: 2026-04-15
- Updated: 2026-04-15
- Tags: system-prompt, prompt-architecture, production-llm, prompt-design, llm-security, reverse-engineering

## Outline

- #Three Philosophies in 500 Tokens
- #The Pattern Nobody Copies
- #Structural Patterns Worth Stealing
- #What the Leaks Mean for Security
- #Ship This Today