Ai-Reliability
- Anthropic Cut 80% of a System Prompt — and the Rules That Replaced It
Anthropic removed over 80% of Claude Code's system prompt with no measured loss on coding evals. The six rules that replaced it are an architecture change, not a diet.
- Claude Opus 5 Is Here — and Half the Instructions in Your Setup Just Expired
Opus 5 reaches near-frontier quality at half Fable's price — and Anthropic's own guide says to delete the verification instructions you wrote for older models.
- Claude Fable 5 Is Here — and the Disciplined Move Is to Route Down, Not Up
Anthropic's Fable 5 is the most capable public model yet — a new Mythos-class tier above Opus. The reflex is to route everything to it. Here's why the disciplined move is the opposite, and the two routing skills I rebuilt the day it shipped.
- The Fluency Trap: Why Catching Bad AI Output Is the Problem, Not the Solution
The Fluency Trap is the reason skilled engineers can't see the architectural drift accumulating in their AI-assisted code. The mechanism, the evidence, the fix.