Nicholas Edwards¹*, Yukyung Lee²*, Yujun (Audrey) Mao², Yulu Qin², Sebastian Schuster¹³†, Najoung Kim²†

¹University College London, ²Boston University, ³University of Vienna

*, † Equal contribution

Paper | Website | Dataset 🤗

📊 Submission Page

Submit your agent here : Go submission page 🚀

📂 Repository Structure

.
├── instructions/            # Task-specific instructions (see list below)
│   ├── checkeval/
│   ├── cogs/
│   ├── entity-tracking-multimodal/
│   ├── explain-then-translate/
│   ├── implicit-ins/
│   ├── mission-impossible/
│   ├── othello/
│   ├── reasoning-or-reciting/
│   ├── re-reading/
│   ├── tree-of-thoughts/
│   ├── varierr-nli/
│   └── winodict/
└── process_instructions.py     # Script for processing instructions

Each subdirectory inside instructions/ contains an instructions.md file that describes the task setting.

✅ Included Tasks

• checkeval
• cogs
• entity-tracking-multimodal
• implicit-ins
• mission-impossible
• othello
• reasoning-or-reciting
• re-reading
• tree-of-thoughts
• varierr-nli
• winodict

🧠 Baseline Agents

• Agent 1: aider (GitHub)
• Agent 2: OpenHands (GitHub)
• Agent 3: Claude Code

Citation

@article{edwards2025rex,
        title={RExBench: Can coding agents autonomously implement AI research extensions?},
        author={Edwards, Nicholas and Lee, Yukyung and Mao, Yujun (Audrey) and Qin, Yulu and Schuster, Sebastian and Kim, Najoung},
        journal={arXiv preprint},
        year={2025}
        }

Contact

Team RExBench ([email protected])