🤖 Anthropic's Claude Fable 5 System Prompt Leak
Instructions totaling approximately 120,000 characters, which define the behavior of the Claude Fable 5 model and its interaction with Anthropic products, have been leaked online. This model is believed to represent a new level of performance (Mythos-class) compared to Claude Opus 4.8.
🌍 Such leaks allow researchers and competitors to analyze alignment methods and the architectural constraints of top-tier models.
👤 Understanding the structure of system instructions helps in better comprehending how AI constraints work and how to more effectively utilize model capabilities.
Source 1: https://x.com/IntuitMachine/status/2064484600722620531 Source 2: https://github.com/asgeirtj/system_prompts_leaks