Long-Horizon-Terminal-Bench 2.0: Automating Diverse Task Construction and Measuring Sustained Agent Progress

Zongxia Li‡, Zhongzhi Li‡, Yucheng Shi‡, Ruhan Wang, Junyao Yang, Chengsong Huang, Zhichao Liu, Xiyang Wu, Anhao Li, Yue Yu, Ergan Shang, Fuxiao Liu, Tong Zheng, Ninghao Liu, Lichao Sun, Haitao Mi, Leowei Liang

‡ Core contribution (marked † in the source paper)

LHTB 2.0 cost and reward comparison across frontier models on 77 tasks

LHTB 2.0 expands process-aware terminal evaluation to 77 tasks across 13 domains, including systematically reconstructed scientific and engineering workflows. Three-hour runs and verifier checkpoints measure sustained progress rather than only binary final outcomes.

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