Copy how the world's best AI behaves. Paste it into a model that costs you almost nothing. About 2 minutes, start to finish.
⚠️ Read this first (so you sound smart, not scammed). This is the claude.ai consumer-chat system prompt, not the API brain or Claude Code. It's a community extraction, not confirmed by Anthropic. Loading it into another model copies Fable 5's behavior and discipline, the way it plans, structures answers, uses tools, and refuses junk. It does not give you Fable 5's raw intelligence. Anyone telling you it does is selling you something. This does the honest, useful version.
What you actually get
A frontier model is two things: an engine (the raw model) and a driver's manual (the system prompt that tells it how to behave). The leak is the driver's manual. You can hand that manual to a cheap engine and it starts driving a lot more like the expensive one.