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Claude Code feels completely different after this hidden Opus 4.8 upgrade Most people think they're using Claude Code. They're not. They're using it in single-player mode. Here's what changed: 1. Set model → Opus 4.8 2. Set reasoning → /ultracode Now Claude doesn't just write code. It starts acting like an AI engineering team. → Detects complex tasks automatically → Breaks them into parallel workflows → Creates orchestration scripts on the fly → Spins up specialized agents for different jobs → …