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Terminal-Bench 2.1

Version 2.1 of Terminal-Bench, a benchmark for evaluating agents in terminal environments.

PaperRepoDataset

How to run

ltb · terminal-bench-2-1
$ npm i -g lettokenburn-cli
$ ltb bench run terminal-bench/terminal-bench-2-1@6 --benchmark terminal-bench-2-1 -a claude-code -m anthropic/claude-opus-4-8
$ ltb bench push

Harbor-native: you can also call Harbor directly.

harbor
$ harbor run -d terminal-bench/terminal-bench-2-1@6 -a claude-code -m anthropic/claude-opus-4-8

Runs happen on your machine with your own subscription; only the score summary is pushed. CLI docs

Scores

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No sourced scores recorded yet.

Every number links to where it was published. Low-confidence rows are muted and need per-cell verification.

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About

Terminal-Bench 2.1

Terminal-Bench is a collection of benchmarks for measuring agents' abilities to complete valuable and complex tasks in container environments. Tasks include assembling proteins for synthesis, debugging async code, and resolving security vulnerabilities.

Terminal-Bench 2.1 is a more verified iteration of Terminal-Bench 2.0. 26 tasks were modified to fix bugs, modify timeouts or resources, or improve robustness to reward hacking. The changes can be found in this PR and many were taken directly from Z.ai's Terminal-Bench 2.0 Verified changes.

Citing Terminal-Bench

If you found our benchmark useful, please consider using the following citation:

@misc{merrill2026terminalbenchbenchmarkingagentshard,
      title={Terminal-Bench: Benchmarking Agents on Hard, Realistic Tasks in Command Line Interfaces},
      author={Mike A. Merrill and Alexander G. Shaw and Nicholas Carlini and Boxuan Li and Harsh Raj and Ivan Bercovich and Lin Shi and Jeong Yeon Shin and Thomas Walshe and E. Kelly Buchanan and Junhong Shen and Guanghao Ye and Haowei Lin and Jason Poulos and Maoyu Wang and Marianna Nezhurina and Jenia Jitsev and Di Lu and Orfeas Menis Mastromichalakis and Zhiwei Xu and Zizhao Chen and Yue Liu and Robert Zhang and Leon Liangyu Chen and Anurag Kashyap and Jan-Lucas Uslu and Jeffrey Li and Jianbo Wu and Minghao Yan and Song Bian and Vedang Sharma and Ke Sun and Steven Dillmann and Akshay Anand and Andrew Lanpouthakoun and Bardia Koopah and Changran Hu and Etash Guha and Gabriel H. S. Dreiman and Jiacheng Zhu and Karl Krauth and Li Zhong and Niklas Muennighoff and Robert Amanfu and Shangyin Tan and Shreyas Pimpalgaonkar and Tushar Aggarwal and Xiangning Lin and Xin Lan and Xuandong Zhao and Yiqing Liang and Yuanli Wang and Zilong Wang and Changzhi Zhou and David Heineman and Hange Liu and Harsh Trivedi and John Yang and Junhong Lin and Manish Shetty and Michael Yang and Nabil Omi and Negin Raoof and Shanda Li and Terry Yue Zhuo and Wuwei Lin and Yiwei Dai and Yuxin Wang and Wenhao Chai and Shang Zhou and Dariush Wahdany and Ziyu She and Jiaming Hu and Zhikang Dong and Yuxuan Zhu and Sasha Cui and Ahson Saiyed and Arinbjörn Kolbeinsson and Jesse Hu and Christopher Michael Rytting and Ryan Marten and Yixin Wang and Alex Dimakis and Andy Konwinski and Ludwig Schmidt},
      year={2026},
      eprint={2601.11868},
      archivePrefix={arXiv},
      primaryClass={cs.SE},
      url={https://arxiv.org/abs/2601.11868},
}