Anthropic says it cut 80 percent of Claude Code's system prompt because Fable 5 models "want a smaller system prompt"

Anthropic has announced an 80% reduction in the system prompt for Claude Code. Staff member Tariq Shihipar noted that the new Fable 5 models require fewer instructions and examples. This change is significant as strict guidelines can hinder the models' performance, which are inherently more creative than the instructions provided. Anthropic is now steering the models through context rather than rigid rules. This shift could enhance AI model performance, allowing them to explore new ideas more flexibly. Such developments may have a substantial impact on future AI application development.