You’re probably prompting Claude Opus 5 completely wrong, and it’s quietly draining your time, patience, and API tokens. The old "step-by-step" prompting advice from last year is officially dead—if you want to get actual work done today, you need to stop micromanaging your models.

We’ll talk about:

• The Opus 5 Shift: The 5 new rules for modern prompt engineering, and why giving the AI the entire job upfront absolutely crushes the old breadcrumb method.
• The "Double-Check" Trap: Why telling your model to "review its work twice" is now a massive waste of tokens, and how to define "good" instead.
• Navigating the 2026 Lineup: How to pick between Haiku, Sonnet, Opus 5, and the elusive Fable 5, plus the real truth about Claude's new "Effort Level" ...