Massive Leak of System Prompts for Next-Gen AI Models Including GPT 5.5 and Claude Fable 5 Discovered on GitHub

Key Takeaways

• Extensive Model Coverage: The leak includes system prompts from all major AI labs, including OpenAI, Anthropic, Google, and xAI.
• Next-Generation Models: Instructions for unreleased or high-tier versions such as GPT 5.5 (Thinking and Instant) and Claude Fable 5 are present.
• Specialized Tool Insights: The repository contains prompts for coding assistants and search platforms like Cursor, VS Code, and Perplexity.
• Continuous Updates: The source indicates that the repository is regularly updated to include the latest model iterations and extractions.

In-Depth Analysis

The Scope of the System Prompt Repository

The emergence of the "system_prompts_leaks" repository on GitHub represents a comprehensive effort to document the underlying instructions of the modern AI ecosystem. System prompts are the foundational directives provided to large language models (LLMs) by their developers to define their persona, operational boundaries, and response styles. According to the repository data, the collection spans multiple generations of models. From Anthropic, the leak includes prompts for the Claude Fable 5 and Opus 4.8 series, as well as specialized versions like Claude Code and Claude Design. This suggests a granular level of extraction that differentiates between general-purpose models and those optimized for specific tasks like programming or visual design.

OpenAI’s contributions to the list are equally significant, featuring the "Thinking" and "Instant" variants of GPT 5.5, along with the Codex model. The distinction between "Thinking" and "Instant" models highlights a tiered approach to model deployment, where different system prompts may be used to manage computational resources and reasoning depth. Google’s section of the leak includes the Gemini 3.5 Flash and 3.1 Pro models, alongside a lesser-known entry titled "Antigravity," pointing toward a diverse internal testing and deployment environment at Google DeepMind.

Specialized Implementations and Third-Party Tools

One of the most revealing aspects of this leak is the inclusion of system prompts for third-party tools and integrated development environments (IDEs). The repository lists prompts for xAI’s Grok, but also extends to tools that utilize these models, such as Cursor, Copilot, and VS Code. By extracting the prompts used in these environments, the repository sheds light on how developers fine-tune base models for specialized workflows. For instance, the prompts for Perplexity likely detail how the AI is instructed to handle real-time web searching and source attribution, which is distinct from the creative or conversational prompts used in standard chatbots.

The presence of these prompts allows for a comparative analysis of how different platforms implement the same underlying technology. It reveals the specific constraints and "personalities" that companies like Cursor or Perplexity impose on the models to ensure they remain helpful and relevant within their specific niches. This level of detail is often guarded as proprietary information, as it represents the "secret sauce" of user experience in AI-driven applications.

The Technical Significance of Prompt Extraction

The extraction of these prompts is a technical feat that highlights the ongoing battle between AI safety researchers and those seeking transparency. System prompts often contain the "guardrails" designed to prevent models from generating harmful content or revealing sensitive information. By making these prompts public, the repository provides a roadmap for understanding how AI companies attempt to solve the alignment problem. The fact that the repository is "regularly updated" suggests a persistent monitoring of AI updates, as companies frequently change system prompts to patch vulnerabilities or improve performance.

Industry Impact

The publication of these system prompts has several major implications for the AI industry. First, it provides a level of transparency that is rarely offered by the developers themselves. Researchers can now analyze the specific wording used to prevent bias or misinformation, which could lead to better industry standards for AI safety. However, this also poses a security risk, as malicious actors could use the knowledge of these internal instructions to craft "jailbreak" prompts designed to bypass the model's intended restrictions.

Furthermore, the leak serves as a form of competitive intelligence. Companies can now see exactly how their rivals are instructing their models, potentially leading to a convergence in model behavior as developers adopt the most effective strategies found in leaked prompts. For the broader developer community, this repository acts as an educational resource, demonstrating the art of prompt engineering at the highest levels of the industry.

Frequently Asked Questions

Question: Which major AI companies are represented in the system prompt leak?

The leak includes system prompts from Anthropic, OpenAI, Google, and xAI. It also covers platforms that integrate these models, such as Perplexity and various coding assistants.

Question: What specific next-generation models are mentioned in the repository?

The repository lists prompts for several advanced models, including OpenAI's GPT 5.5 (Thinking and Instant versions), Anthropic's Claude Fable 5 and Opus 4.8, and Google's Gemini 3.5 Flash and Antigravity.

Question: Is the repository a one-time leak or an ongoing project?

According to the source information, the repository is regularly updated, meaning it aims to provide the most current system prompts as new models are released or as existing prompts are modified by their developers.