System Prompts Leaks
Documented system prompts from Anthropic - Claude Fable 5.1, Opus 5.5, Claude Design, Claude Code. OpenAI - ChatGPT GPT-6-Astra, Codex. Google - Gemini 3.8 Flash, 3.1 Pro, Antigravity. xAI - Grok, Grok Bot, Cursor, Kimi and more! Updated regularly.
FreeOpen source
What you get
System Prompts Leaks is a free, open-source agent skill published on GitHub by asgeirtj.
Documented system prompts from Anthropic - Claude Fable 5.1, Opus 5.5, Claude Design, Claude Code. OpenAI - ChatGPT GPT-6-Astra, Codex. Google - Gemini 3.8 Flash, 3.1 Pro, Antigravity. xAI - Grok, Grok Bot, Cursor, Kimi and more! Updated regularly.
GitHub stars: 70,032
License: CC0-1.0 (free to use)
Language: Python
Topics: ai, ai-agents, ai-prompts, anthropic, chatbot, chatgpt, claude, claude-code
Last updated: 2026-10-19
How to get it: open the repository on GitHub, read the README and follow the setup steps. HEEEXY lists it in the Lab because it is popular, actively maintained and openly licensed.
More for agent skills
- Spec Kit: GitHub's spec-driven development toolkit. Open source (MIT), free to use.
- gstack: Garry Tan's opinionated Claude Code setup (23 tools). Open source (MIT), free to use.
- Addy Osmani Agent Skills: Production-grade engineering skills for coding agents. Open source (MIT), free to use.