Claude Code 的提示词减少 80%——为何 Fable 5 模型更少即是更多
anthropic 将 claude code 的系统提示词减少了 80%，因为发现 fable 5 模型在指令较少时表现更好。这改变了开发者优化 ai 模型性能的方式。
anthropic has reduced claude code's system prompt by 80%, discovering that its fable 5 models perform better with less rigid instruction. engineer tariq shihipar notes that adding examples now tends to constrain the model's imagination rather than guide it, marking a reversal from previous engineering trends. the company now prioritizes context-based steering over explicit 'do not do this' constraints. this suggests that as models scale, their interaction patterns must fundamentally change to maximize utility.