LegalBench.PT

LegalBench.PT is the first comprehensive legal benchmark specifically designed for the European Portuguese context. It assesses large language models' legal knowledge and reasoning abilities across key areas of the Portuguese law.

📄 Paper: https://arxiv.org/abs/2502.16357

🤗 Dataset: https://huggingface.co/datasets/BeatrizCanaverde/LegalBench.PT

About

LegalBench.PT provides a rigorous evaluation framework that:

• Covers 31 fields of law, grouped into 5 main/broader areas
• Includes 6 diverse question types that allow for an automated evaluation:
  • Multiple-Choice: Questions with only one correct option
  • Cloze Tasks: Fill-in-the-blank exercises formulated as multiple-choice
  • Case Analysis: Multiple-choice questions. The difference from the former type is solely related to the exam questions used to create them. Case analysis questions were created from theoretical exercises, while multiple-choice were created from practical problems.
  • True/False: Classification of statements as either "True" or "False"
  • Multiple Selection: Multiple-choice questions where more than one option can be correct
  • Matching Questions: Require respondents to pair items from two columns

Installation

Install the required dependencies:

pip install -r requirements.txt

Usage

1. Generate Model Predictions

Run your model on LegalBench.PT to generate predictions:

python generation.py \
    --model_path <path_to_your_model> \
    --max_len 1000 \
    --temperature 0.001 \
    --output_path <path_to_save_predictions.jsonl> \
    --seed 42

max_len, temperature, and seed can be omitted above.

2. Evaluate Model Answers

Evaluate the generated predictions against the ground truth:

python evaluation.py evaluate_model_answers \
    --input_path <folder_path_with_predictions> \
    --output_path <folder_path_to_save_evaluations>

3. Compute Model Scores

Calculate aggregate scores across all evaluations:

python evaluation.py compute_model_scores \
    --input_path <folder_path_to_save_evaluations> \
    --output_path <folder_path_to_save_aggregated_scores>

Citation

Please cite the following paper if you use LegalBench.PT in your work:

@misc{canaverde2025legalbenchptbenchmarkportugueselaw,
      title={LegalBench.PT: A Benchmark for Portuguese Law}, 
      author={Beatriz Canaverde and Telmo Pessoa Pires and Leonor Melo Ribeiro and André F. T. Martins},
      year={2025},
      eprint={2502.16357},
      archivePrefix={arXiv},
      primaryClass={cs.CL},
      url={}, 
}