149 Pages Mapping the Long-Horizon Agent Frontier: Multi-University Survey Proposes Harness Engineering and Model Optimization as Two Main Evolution Lines for Next-Generation AI Agents

Renmin University GAIR leads multi-institution 149-page survey on long-horizon agents, proposing H1-H3 task difficulty hierarchy and C1-C3 capability tiers, with task span doubling every 4-7 months.