
Anthropic cut 80% of Claude Code’s system prompt — what it m
Anthropic removed over 80% of Claude Code’s system prompt with no eval loss. Your CLAUDE.md might be fighting Opus 5. Learn how to audit and fix it.
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Anthropic removed over 80% of Claude Code’s system prompt with no eval loss. Your CLAUDE.md might be fighting Opus 5. Learn how to audit and fix it.

Anthropic deleted 80% of Claude Code’s system prompt with zero eval loss. Here’s how to audit your CLAUDE.md and strip the dead weight today.

You will never notice this one, because a shorter list of bugs looks exactly like a cleaner codebase. Every engineer
Anthropic cut over 80% of Claude Code system prompt for Opus 5 with no eval loss. What that means for your CLAUDE.md, and how to audit it without breaking things.

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