Your Coding Agent Is a Slot Machine

 Update (Dec 19): I originally stated this used Sonnet 4.5. I discovered my script wasn’t picking up the --model flag, so Claude Code used automatic model selection—which typically means Opus. This makes the Vibe comparison more significant: an open-weight model matching Anthropic’s flagship, not just Sonnet. 
 
 TL;DR 
 Same agent. Same bug. Same prompt. Different…