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Claude Opus 4.7 prompts differently than 4.6. If your outputs have felt off since the upgrade, here’s exactly why — pulled from Anthropic’s official prompting guide, with the exact phrasings to use.
Why Your Outputs Got Weirder
If you haven’t updated how you prompt since Claude Opus 4.7 dropped, you might have noticed the outputs getting shorter, more literal, or weirdly off. That’s not a regression — it’s a deliberate set of behavior changes Anthropic published. The fix is a handful of small phrasing updates. Here they are, with the verbatim quotes from the official guide.
Change 14.7 Interprets You More Literally
In 4.6, “clean up this draft” would fix typos, tighten sentences, and restructure the whole thing. In 4.7 it’ll do exactly what you said and nothing more. Anthropic puts it this way:
“Claude Opus 4.7 interprets prompts more literally and explicitly than Claude Opus 4.6, particularly at lower effort levels. It will not silently generalize an instruction from one item to another, and it will not infer requests you didn’t make.” — Anthropic prompting guide, “More literal instruction following”
The fix: spell out every step. Replace vague verbs with explicit lists.
Old (4.6) — worked fine
“Clean up this draft.”
New (4.7) — works much better
“Fix any typos, tighten any sentence over 25 words, and remove anything unnecessary. Keep the structure.”
Change 2Response Length Now Auto-Adjusts
4.7 calibrates length to how complex the task looks. “Summarize this” gets you one sentence. “Walk me through this” gets you several paragraphs. Anthropic:
“Claude Opus 4.7 calibrates response length to how complex it judges the task to be, rather than defaulting to a fixed verbosity. This usually means shorter answers on simple lookups and much longer ones on open-ended analysis.” — Anthropic prompting guide, “Response length and verbosity”
The fix: if you want depth, explicitly ask for depth.
Gets you 1 sentence
“Summarize this.”
Gets you a real breakdown
“Give me a full breakdown of this in 3-4 paragraphs, not a summary. Cover the main argument, the evidence, and the counterargument.”
Change 3Stop Using ALL CAPS and “You MUST”
If you developed habits like writing “CRITICAL:” or “YOU MUST DO X” in your prompts to push older models, drop them — 4.7 overcorrects on aggressive phrasing and starts overtriggering. Anthropic:
“If your prompts were designed to reduce undertriggering on tools or skills, these models may now overtrigger. The fix is to dial back any aggressive language. Where you might have said ‘CRITICAL: You MUST use this tool when…’, you can use more normal prompting like ‘Use this tool when…’.” — Anthropic prompting guide, “Tool usage”
The fix: just talk to it normally.
Old habit — now overtriggers
“CRITICAL: You MUST use the calculator tool for ANY math.”
Normal phrasing
“Use the calculator for math problems.”
Change 4Add “Go Beyond the Basics” for Creative Work
For anything creative — design, writing, building from scratch — 4.7 will give you exactly what you asked for and stop. There’s a magic phrase from the Anthropic guide that pushes it past the bare minimum:
“Create an analytics dashboard. Include as many relevant features and interactions as possible. Go beyond the basics to create a fully-featured implementation.” — Anthropic prompting guide, “Be clear and direct” (their example, emphasis ours)
The fix: add “go beyond the basics” to any creative prompt.
Gets you a minimum-viable version
“Design a landing page for my app.”
Gets you something to actually ship
“Design a landing page for my app. Go beyond the basics — include hero, social proof, feature breakdown, pricing, FAQ, and a final CTA.”
Change 54.7 Doesn’t Reason by Default — Turn It On
Extended thinking is OFF by default in 4.7 unless you explicitly enable it. That’s a big difference from how earlier reasoning-capable models behaved. Two ways to fix it:
• If you’re using the API: set the effort parameter to high or xhigh for tasks that need multi-step reasoning.
• If you’re prompting in chat: add Anthropic’s actual recommended phrasing.
“This task involves multi-step reasoning. Think carefully through the problem before responding.” — Anthropic prompting guide, recommended phrasing
The fix: for any prompt that needs real thought, add the line above. I’ve A/B tested it on the same tasks and the difference in output quality is consistent.
Save ThisThe 4.7 Prompting Cheat Sheet
Bookmark this. Use it the next time your Claude output feels weirdly short, off, or stuck at the bare minimum.
• If it’s being too literal: spell out every step explicitly.
• If the answer is too short: ask for “a full breakdown, not a summary.”
• If you wrote “CRITICAL” or “MUST”: rewrite normally.
• If you want it to push: add “go beyond the basics.”
• If it needs to think: add “Think carefully through the problem before responding,” or set effort to high/xhigh in the API.
The Real Win
None of these are workarounds — they’re the operating manual. Anthropic published this for a reason: 4.7 isn’t worse than 4.6, it just expects you to be more explicit about what you want. The 90 seconds of phrasing change is the entire upgrade.