LegalOne-8B: Foundation Model for Reliable Chinese Legal Reasoning
LegalOne-8B is an 8 billion parameter large language model developed by CSHaitao, specifically designed for the Chinese legal domain. It addresses the limitations of general LLMs in handling the knowledge-intensive and structure-intensive nature of legal reasoning by employing a multi-stage training framework. This model is built on the Qwen3-8B-Base architecture and supports both Chinese and English.
Key Capabilities
- Enhanced Legal Knowledge: Incorporates a vast corpus of legal documents, including academic papers, court judgments, regulations, and legal consultations, carefully filtered for relevance and validity.
- Advanced Legal Reasoning: Utilizes a novel Legal Agentic CoT Distillation (LEAD) system for supervised fine-tuning, simulating professional legal workflows to generate high-quality, consistent reasoning trajectories.
- Multi-stage Training: Employs Plasticity-Adjusted Sampling (PAS) for mid-training to smoothly transition from general to specialized legal tasks, preventing catastrophic forgetting while injecting legal knowledge. Reinforcement learning further refines reasoning abilities.
- Strong Performance: Outperforms general LLMs and existing legal models in tasks such as statute interpretation, case law reasoning, legal Q&A, and document drafting. Achieves performance comparable to or surpassing larger general models (e.g., DeepSeek-R1, Qwen3-Max) on benchmarks like LexEval and JecQA, particularly in legal concept understanding and multi-hop reasoning.
Good For
- Legal Research and Analysis: Assisting with complex legal inquiries, providing detailed analyses of case facts, and interpreting regulations.
- Legal Document Generation: Drafting legal documents, summaries, and opinions based on provided information.
- Judicial Prediction: Offering insights into potential court judgments and legal applicability.
- Developing Legal AI Systems: Serving as a robust foundation model for building specialized legal AI applications requiring high reliability and accuracy in the Chinese legal context.