PAKTON: A Multi-Agent Framework for Question Answering in Long Legal Agreements

Contract review is a complex and time-intensive task that typically demands specialized legal expertise, rendering it largely inaccessible to non-experts. Moreover, legal interpretation is rarely straightforward-ambiguity is pervasive, and judgments often hinge on subjective assessments. Compounding these challenges, contracts are usually confidential, restricting their use with proprietary models and necessitating reliance on open-source alternatives. To address these challenges, we introduce PAKTON: a fully open-source, end-to-end, multi-agent framework with plug-and-play capabilities. PAKTON is designed to handle the complexities of contract analysis through collaborative agent workflows and a novel retrieval-augmented generation (RAG) component, enabling automated legal document review that is more accessible, adaptable, and privacy-preserving. Experiments demonstrate that PAKTON outperforms both general-purpose and pretrained models in predictive accuracy, retrieval performance, explainability, completeness, and grounded justifications as evaluated through a human study and validated with automated metrics.

@article{raptopoulos2025_2506.00608,
  title={ PAKTON: A Multi-Agent Framework for Question Answering in Long Legal Agreements },
  author={ Petros Raptopoulos and Giorgos Filandrianos and Maria Lymperaiou and Giorgos Stamou },
  journal={arXiv preprint arXiv:2506.00608},
  year={ 2025 }
}