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Your CLAUDE. md is making Opus 5.5 DUMBER. Stuff like “double-check your work” and “think step by step” was advice for yesterday’s models. On Opus 5.5, it’s drag slower responses, weaker output. Lance Martin over at Anthropic just pushed the remedy. Open Claude Code and run: /claude-api prompt-audit It... show more
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Anthropic just published its official prompting guide for Opus 5.5. If you're still writing prompts the way you did for Opus 5, you're paying more and getting less. Here's what changed 👇 1. Default to medium effort Medium on 5.5 already outperforms high on Opus 5, at a lower cost. Maxing it out by habit just burns tokens. 2. Drop "think step by step" Reasoning is built in now. The model decides how much thinking a task needs, so asking it to think harder adds nothing. 3. A check-in isn't a finish line On long runs, it sends progress updates along the way. If it stops to report, tell it to keep going. 4. Fence off anything you paste Put emails, docs, and web text in clearly labeled sections or tags. That way it can tell your instructions apart from the material it's working on. 5. Retire your image workarounds Those custom chart readers and OCR steps you built are probably dead weight. It reads screenshots, diagrams, and charts accurately on its own. 6. For design work, name what you don't want "Make it unique" gets you generic. "No purple gradients, no centered hero, no emoji icons" gets you something different. It follows specific bans much better than vague direction. ♻️ Repost to save someone a few API bills.
Charlie Hills
184,401 views • 6 days ago
