Annlex

Annlex is a legal research platform that combines a large database of U.S. court opinions with an AI-based conversational search interface, positioned for use by solo practitioners, small firms, and researchers.

Key features and functions include:

Annlex Chat
A conversational research interface that returns responses generated from retrieved court opinions, with citations and links to the underlying source text for each case referenced.

Opinion Lens
A verification tool that lets users check an AI-generated summary or characterization against the original opinion, highlighting relevant passages, named entities, and cited cases in context.

Case Law Database
Provides access to a stated 10.5 million full-text court opinions covering federal and state jurisdictions, spanning from 1658 to the present, along with a stated 71 million citation relationships between cases and associated court metadata (judges, procedural history, case summaries).

Data Sourcing
Case law data is sourced from CourtListener/Free Law Project, which the vendor states aggregates historical records from the Harvard Law School Library, the Library of Congress, Public.Resource.Org, Lawbox, Inc., and Justia.

AI Architecture
Annlex uses a retrieval-based approach in which relevant court opinions are loaded into the model's context before a response is generated, rather than relying on the model's recall of case law from training. The platform connects to Anthropic's Claude Messages API directly for response generation.

Data Handling
Annlex states it does not log or retain search queries or chat conversations, and that account-related data collection is limited to authentication information (such as email) and anonymized usage analytics.