Deep Research in CoCounsel Legal builds a research plan, works through each step, and delivers a cited report
Highlights
- Deep Research plans, executes each step, and delivers a cited report grounded in Westlaw and Practical Law.
- KeyCite signals and 1,500 attorney-editors keep outputs grounded in current, verifiable, jurisdiction-specific law.
- Visible reasoning, linked citations, and Deep Research Verify let you check the work and refine the analysis.
Every legal AI platform claims deep research. Most are delivering sophisticated search. The difference matters — and it’s measurable. True deep research requires three interdependent elements: AI that can reason through complexity, access to verified legal content, and complete transparency in how conclusions are reached. Remove any one of these, and you have a tool that cannot meet the standards legal professionals require. Deep Research in CoCounsel Legal delivers all three.
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The difference between search and research
Content integrity is non-negotiable
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What is Deep Research? The AI research assistant that thinks like a legal expert
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The difference between search and research
Traditional AI legal tools generate answers based on patterns in training data. They return results, often with citations, and leave the interpretation entirely to you. Deep Research in CoCounsel Legal operates differently. It uses agentic technology that builds a plan and executes each step automatically, the way an experienced researcher would.
The distinction matters because research involves judgment. When you face a complex legal question, the path to an answer is rarely linear. You need a system that can formulate a research plan, recognize when early results call for a different approach, and change course accordingly. Deep Research sets goals, selects appropriate tools, and executes a multi-step process that mirrors the reasoning of an experienced attorney.
You describe the question in plain language. Deep Research develops the approach, works through each step, and returns a multi-step report that surfaces key precedents and relevant authorities, with every citation linked. It reasons from Westlaw and Practical Law together, so the report draws on both primary law and expert practice guidance. This includes sources from Reuters News, so you even get any relevant late-breaking news on your topic.
If your AI research tool simply returns a list of potentially relevant sources, it’s performing search. Research requires the system to understand what the results mean and how they connect to your question.
Content integrity is non-negotiable
The foundation of reliable legal research is the quality of the underlying content. This is where many AI solutions fall short. They rely on web-scraped data, general legal databases, or training data that may not reflect current law.
Deep Research draws on Westlaw’s verifiable content and professionally maintained resources including KeyCite, the Key Number System, and annotated statutes. These sources are supported by dedicated specialists who shape the AI outputs, plus more than 1,500 full-time attorney-editors who continuously curate, validate, and organize legal materials. This jurisdiction-specific, up-to-date foundation ensures that every output is grounded in valid law.
The system also recognizes KeyCite validity signals: red and yellow flags that indicate when cases have been overruled or treated negatively. This awareness factors directly into the analysis, allowing Deep Research to guide its reasoning accordingly. Behind each flag is editorial work. Trained analysts describe a case’s history in the citing court’s own words, and attorney-editors verify direct history and add negative indirect history. Direct history appears within 24 hours of a reported opinion loading to Westlaw, and KeyCite Overruling Risk uses AI to flag a point of law that may rest on an overruled decision. If your AI tool cannot distinguish between good law and questionable authority, it cannot produce research you can rely on.
Competitors are now announcing AI-native citators and hiring attorney-editors to support them. Those products are still in beta, and the details a researcher needs, such as which jurisdictions are covered, how deeply cases are treated, and how accuracy is measured, have not been published.
Westlaw’s editorial enhancements have been relied on for more than a century, and attorney-editors still do the work. When a court issues a decision, they write headnotes for each distinct point of law, classify them to the Key Number System, and fix errors in the raw opinion text, more than 100,000 a year. CoCounsel Legal reasons from that work, informing the research as it happens. Every case added to KeyCite gets editorial analysis, and every citation in a Deep Research report is linked for you to verify.
Transparency builds trust
Legal professionals need to understand how conclusions were reached. A black-box AI that produces answers without showing its work fails the basic requirement of professional responsibility.
Deep Research provides a detailed audit trail. Each report includes a research log that documents which questions were explored, what sources were consulted, and how conclusions were formed. You can review the steps taken, examine citations directly, and evaluate the reasoning based on your own expertise. This level of transparency allows you to verify results, identify potential gaps, and refine the analysis as needed. Deep Research Verify builds that review into the workflow with built-in support for reviewing and validating the underlying law behind a report. It helps you check the authorities for yourself and make confident, well-supported decisions.
The system also engages in dialogue. When faced with ambiguity — a common reality in legal research — Deep Research asks clarifying questions and adapts its approach based on your input and new information uncovered during the process. The collaborative approach ensures the final output aligns with your specific needs.
From research to execution
Deep Research doesn’t stop at understanding the law; it connects you to applying it. By integrating the authority of Westlaw with the practical guidance of Practical Law, it moves you from legal foundation to actionable strategy in a single workflow.
The same approach carries into drafting and review, for litigators and transactional attorneys alike. In litigation, Brief Builder adds citation checking and quote verification before anything is filed, and you stay in control at every step. In transactional work, CoCounsel for Word builds a first draft grounded in Practical Law content and your firm’s precedents, with suggestions delivered as redlines you accept or dismiss.
When you need to assess large document sets for due diligence, disclosure requirements, compliance reviews, or privilege determinations, Tabular Analysis lets you review up to 10,000 documents and ask up to 100 questions. You get a table you can filter and sort, and every answer traces back to a clickable footnote. It compresses review cycles that would otherwise consume weeks of attorney time. Research, drafting, and review all run on the same verified content foundation.
Defining the standard
As AI research tools multiply, the differences between solutions become harder to discern from marketing materials alone. The real test is whether a system can deliver validated results with transparent reasoning, grounded in content you can verify.
A deep research tool isn’t truly effective unless it integrates professionally curated legal content, reveals the reasoning behind its conclusions, and views research as a thoughtful process rather than just a one-step query.
The legal profession demands more than sophisticated pattern matching. You need AI that understands the structure of legal reasoning, works with verified sources, and provides the transparency required to meet professional obligations. Deep Research in CoCounsel Legal is Fiduciary-Grade AI™ built to that standard.
Our white paper, “How trustworthy content transforms deep research,” examines each of these elements in detail — the content infrastructure behind the analysis, the reasoning architecture that makes transparency possible, and what it means in practice for attorneys who need research they can stand behind. Download the full piece and see how the standard applies to your work.
