Claude Fable 5 system prompt leak

Pliny the Liberator has done it again! A beast at over 120,000 characters (~27,000 tokens?) long, here is Claude Fable 5's system prompt in full: https://github.com/elder-plinius/CL4R1T4S/blob/main/ANTHROPIC/CLAUDE-FABLE-5.md

Masses of guardrails, Jan 2026 knowledge cut-off, very self-referential. It's almost like it's writing it's own fan fiction, and covering every single edge case.

No wonder it gorges through your credits!