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

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

Anthropic has cut the system prompt for Claude Code by 80 percent. According to staffer Tariq Shihipar, the new Fable 5 models need fewer instructions and examples.

July 3, 2026
3 min2 viewsThe Decoder