How to Tame Claude Opus 5's Verbose Responses With Better Prompt Rules

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Claude's Opus 5 model has a tendency to produce overly long, wordy responses even when users have concise-reply instructions set in their CLAUDE.md configuration file. Unlike its predecessor, Opus 5 appears to process more rules simultaneously and self-checks its work, causing specific brevity instructions to get crowded out. Developers can improve this by writing more precisely shaped rules that define the desired response structure — such as answer-first formatting, bullet lists over prose, and paragraph caps — rather than vague directives like 'be concise.' A stronger fix is converting these rules into a custom output style saved at .claude/output-styles/, since output styles are injected into the system prompt rather than arriving as a user message, giving them more persistent influence. Claude Code also re-surfaces active output styles during a session, meaning the formatting rule is reinforced over time rather than fading after a single mention.

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