I use a 9-agent SDD harness where each phase uses a different model. The total cost is $10-15/month. Here's the full breakdown.
A principal architect has developed a cost-effective coding workflow using a multi-agent system that leverages different AI models for specific tasks. This approach, called Spec-Driven Development (SDD), assigns distinct AI models to each of the nine phases of the development process, optimizing for cost and capability. For instance, DeepSeek V4 Flash is used for initial repository mapping, while DeepSeek V4 Pro handles more complex specification and coding phases, and Qwen3-Coder is employed for verification. AI
IMPACT Demonstrates a practical, cost-saving approach to leveraging diverse AI models for specialized development tasks.