Everyone is testing Opus 5’s capabilities, but Anthropic’s own prompting guide reveals a different advantage. These 5 rules uncover the small changes you need to know.. Ai Fire 101, 🔥 Ai Fire Academy.
TL;DR
Claude Opus 5 works best when you stop using old Claude prompting habits. This Claude prompting guide shows how to prompt Claude with clearer scope, better limits, and shorter outputs.
The main idea is simple: give Opus 5 the full job upfront, then define where the job ends. Don’t split every task into tiny steps unless the work truly needs that.
You’ll learn how to choose between Haiku, Sonnet, Opus 5, and Fable 5, plus which effort level to use. You’ll also get 5 rules for writing the best Claude prompts for real knowledge work, including websites, research, planning, and client tasks.
Key points
Fact: Low and medium effort are already strong for most Opus 5 tasks.
Mistake to avoid: Don’t assume higher effort always means better output.
Takeaway: Give Claude a clear finish line before it starts.
Table of Contents
Introduction
“Opus 5 is a WASTE? It costs more, it’s not as good as Fable, Opus 4.8 is the best.”
So why would Anthropic change the name from Opus 5 if the improvement wasn’t big enough? Why not Opus 4.9?
For me, before, some tasks needed 2-3 prompts to get the result I wanted (using Opus 4.8). With Opus 5, I can often get the same quality with just 1 prompt. So which one costs more now?
To understand why Opus 5 works differently, I went through Anthropic’s new prompting guide carefully and tested the rules behind it.
These 5 prompting rules are the key to getting much better results from Opus 5 without wasting extra tokens or paying more than necessary. Let’s get into it.
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