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Claude Fable 5 System Prompt, Stripped Clean
A cleaned up version of Anthropic’s released Claude Fable 5 behavioral system prompt with all Claude wires cut away and generalized for any modern LLM.
Adapted version of Anthropic’s released Claude Fable 5 / Mythos 5 system prompt. The original includes a bunch of Claude specific wiring such as XML norms, MCP/tool interface, product behavior and artifacts which is of no use outside of Claude. This version removes all of that to focus on the generalizable behavioral advice for being honest about uncertainty, effective communication, writing good code, making reasonable trade-offs and minimizing meta-commentary. Available in small (fewest tokens), medium (balanced) and full versions.
Why a vibe-coder should care
If you have a few different AIs and want to get consistent thoughtful responses across all of them, you can use one of these three versions of the system prompt.
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