asgeirtj/system_prompts_leaks · Alignment & Safety

Claude Fable 5 (System Prompt Leak)

Leaked system prompt referencing "Claude Fable 5," described as the first model in a new Claude 5 family and part of a "Mythos-class" tier positioned above Claude Opus. The leak indicates Fable 5 is the safety-restricted public model while a companion "Claude Mythos 5" offers the same capabilities without restrictions to approved organizations. Unverified.