How to Build a Team of AI Agents That Actually Finishes the Work

TL;DR

New AI models like GPT-5.6 Sol, Kimi K3, and Claude Opus 5 are capable of holding jobs, inspecting files, searching, calling tools, and using terminals.
These models can now work for extended periods, with teams of agents splitting complex tasks across research, planning, execution, and review phases.
The fundamental change is from generating single answers to completing entire processes, transforming the unit of AI work.
The power and danger of multi-agent systems lie in the handoffs between agents, where structured collaboration is crucial.
Effective multi-agent systems require "graph engineering" to define roles, inputs, outputs, decision points, and human intervention points.