AQuAECHR: Attributed Question Answering for European Court of Human Rights

LLMs have become prevalent tools for information seeking across various fields, including law.However, their generated responses often suffer from hallucinations, hindering their widespread adoption in high stakes domains such as law, which can potentially mislead experts and propagate societal harms.To enhance trustworthiness in these systems, one promising approach is to attribute the answer to an actual source, thereby improving the factuality and verifiability of the response.In pursuit of advancing attributed legal question answering, we introduce AQuAECHR, a benchmark comprising information-seeking questions from ECHR jurisprudence along with attributions to relevant judgments.We present strategies to automatically curate this dataset from ECHR case law guides and utilize an LLM-based filtering pipeline to improve dataset quality, as validated by legal experts.Additionally, we assess several LLMs, including those trained on legal corpora, on this dataset to underscore significant challenges with the current models and strategies dealing with attributed QA, both quantitatively and qualitatively.