Is Agent OS 2.1 a productivity breakthrough or just more process overhead? To find out, I paired the latest version of Agent OS with the newly released Claude Opus 4.5 to build a native iOS application from scratch. But I didn't just test Agent OS in isolation. Drawing on my experience with BMAD, Spec Kit, and Open Spec, I break down exactly how Agent OS differs from the pack. In this video, I analyze the differences in iteration speed, token usage, and architectural control across these methodologies. We look at where Agent OS shines (context efficiency), where it lags behind frameworks like BMAD (spec generation), and whether you actually need a strict methodology at all in the era of high-intelligence models. 🔗 *Methodologies & Resources:* - Agent OS: - BMAD: - Spec Kit: - Open Spec: - Claude Code Templates (aitmpl): ⏱️ *Timestamps:* 00:00 - The Hook: Agent OS 2.1 & Claude Opus 4.5 00:48 - The Project: Native iOS Teleprompter 01:21 - Agent OS Architecture & Configuration 02:24 - The Workflow: Slash Commands (Plan to Tasks) 03:48 - Implementation Mode: Simple vs. Orchestrated 04:52 - Speed Comparison: Which mode is faster? 05:01 - Quality Comparison: Code results 05:36 - The Benefits: Context Efficiency & Standards 06:25 - Potential Issues: The "Bug Fix" Gap & Skills Oversight 07:45 - COMPARISON: Agent OS vs. Other Frameworks 07:49 - Agent OS vs. BMAD (v4 & v6 Alpha) 08:09 - Agent OS vs. Spec Kit & Open Spec 08:38 - Conclusion: Methodology vs. Model Intelligence --- About The Gray Cat: Where AI meets code. An essential guide to building next-generation software with modern AI tooling, focusing on AI IDEs like Cursor, the Model-Context Protocol (MCP), and practical AI app development. #AIcoding #AgentOS #ClaudeOpus #iOSDev #SoftwareEngineering