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Fable 5's system prompt in Claude Code has several significant changes to help it take advantage of its greater autonomous capabilities compared to Opus. Shari

Fable 5's system prompt in Claude Code has several significant changes to help it take advantage of its greater autonomous capabilities compared to Opus. Sharing a diff of the system prompts here: https://twelvetables.blog/comparing-claude-fable-5s-system-prompt-to-opus-4-8/ https://twelvetables.blog/comparing-claude-fable-5s-system-p... The big difference is that the system prompt has a whole section dedicated to directing Fable how to communicate with users, and give them greater information about the (assumedly long-horizon) tasks it has completed.

boppo1 4mo ago
Is the system prompt available somewhere? Can it be modified?
- matltc 4mo ago
  Iirc there are at least two cli flags that should do this. Can't remember the disabler--check `claude --help`. `--append-system-prompt` to overwrite.