Best Alternatives to GLM-Legal in 2025

Harvey is a leading legal AI platform built specifically for elite law firms and in-house teams. It offers advanced contract analysis, due diligence, and legal research capabilities, and its own Legal Agent Benchmark is a standard for evaluating legal AI. Harvey provides a more comprehensive, production-ready solution with extensive integrations and a proven track record in high-stakes legal environments.

CoCounsel, powered by GPT-4 and developed by Casetext (now part of Thomson Reuters), is a trusted legal AI assistant for document review, legal research, and deposition preparation. It excels at quickly analyzing large volumes of documents and providing citations, making it a strong alternative for firms needing reliable, citation-backed legal insights without building custom models.

Spellbook is an AI contract drafting and review tool that integrates directly into Microsoft Word. It uses large language models to suggest edits, flag risks, and draft clauses in real time. For legal teams focused primarily on contract review and drafting, Spellbook offers a more seamless, user-friendly experience than a standalone model like GLM-Legal.

Luminance specializes in legal document analysis and contract review using proprietary AI. It is particularly strong in due diligence, compliance, and anomaly detection across large document sets. Its focus on pattern recognition and risk flagging makes it a robust alternative for compliance-heavy legal work.

Kira is a well-established contract analysis tool that uses machine learning to extract and analyze clauses from contracts. It is highly customizable and widely used for M&A due diligence, lease abstraction, and compliance. Kira offers a mature, enterprise-grade alternative with proven accuracy in structured legal review tasks.

LegalBERT is an open-source language model pre-trained on legal texts, designed for legal NLP tasks such as contract classification, named entity recognition, and legal question answering. For teams with machine learning expertise who want to build custom legal AI solutions, LegalBERT provides a flexible, cost-effective foundation compared to proprietary models like GLM-Legal.

Claude 3, especially the Opus and Sonnet models, has demonstrated strong performance on legal reasoning and document analysis tasks when guided with appropriate prompts. It offers a general-purpose, highly capable alternative that can handle contract review, compliance research, and evidence analysis without needing a specialized legal model, and it can be integrated via API into custom legal workflows.