Is There a Legal Version of ChatGPT?

Yes. OpenAI's Astra for Law combines GPT-6 Astra with legal search and instructions for legal work, with initial direct access limited to selected law firms.

For in-house law departments, GC AI is the first option we recommend evaluating. It combines company documents, legal instructions, source citations, and a Microsoft Word workflow in one platform.

The relevant shortlist as of October 2026 is:

GC AI for recurring in-house legal work
ChatGPT Enterprise for organizations already standardized on ChatGPT
Astra for Law for eligible firms evaluating OpenAI's legal research configuration
Claude for Legal for teams willing to configure plugins and research connections
CoCounsel for departments using Westlaw and Practical Law
Harvey for enterprise legal research, contract workflows, and large-document review

GC AI is an enterprise legal AI platform built for in-house teams by three-time general counsel Cecilia Ziniti, who led legal at Anki, BloomTech, and Replit. Its customers include the legal departments at Liquid Death, Arc'teryx, Tipalti, and Snyk.

Ziniti's in-house experience informs GC AI's system instructions, tone, and workflows. That gives legal teams a starting point designed around their work; with a general-purpose ChatGPT workspace, the team supplies its own legal instructions and review standards.

What a Legal Version of ChatGPT Has to Do

Use these four checks to compare the setup your legal team would use.

Use legal instructions: the answer should ask clarifying questions, avoid irrelevant consumer disclaimers, and flag issues the reader did not raise.
Cite checkable sources: quote the clause behind a finding and cite primary law for a legal proposition. Our AI hallucination legal cases tracker shows what happens when nobody checks.
Protect confidentiality: check the service agreement, data processing agreement, retention, subprocessors, and model-training commitments for the account and connected tools. ABA Formal Opinion 512 addresses lawyers' duties of competence and confidentiality when using generative AI.
Work inside Word: test redlines, comments, and playbook checks, then confirm which model and tools the add-in uses.

The six options below differ in how much of that workflow they provide and how much your team needs to configure.

Six Options for a Legal Version of ChatGPT

The descriptions come from each vendor's public site or documentation, and the fit line is ours. ChatGPT Enterprise is a workspace offering; Astra for Law is a legal configuration with separate access requirements.

Option	Built For	Citations	Where It Runs	Best Fit
GC AI	In-house legal teams from solo GCs to Fortune 500 legal departments	Exact Quote gives character-level citations to your own documents, and Research and US Case Law cite primary law	Web app, GC AI for Word, Slack, and an API	In-house teams that want ChatGPT's fluency with their contracts, standards, and Word built in
ChatGPT Enterprise (OpenAI)	A whole company, with legal supplying its own instructions	Web sources and connected company apps	Web, desktop, mobile, and ChatGPT for Word	Companies already standardized on ChatGPT, with legal willing to own its own prompts and checks
Astra for Law (OpenAI)	Law firms and legal software companies; initial direct access for selected U.S. firms	U.S. Legal Search Index	ChatGPT and Codex through Trusted Access; API coming soon (as of October 1, 2026)	Eligible firms evaluating legal research
Claude for Legal (Anthropic)	In-house teams working in Claude	Marked unverified unless a research connector such as CourtListener is attached, per Anthropic	Claude web chat, Desktop Chat, Cowork, Claude Code, Managed Agents API, and Microsoft 365; component support varies	Teams with a lawyer who will own the setup and connect a research tool
CoCounsel (Thomson Reuters)	Law firms and corporate legal departments on the Westlaw and Practical Law stack	Linked to Westlaw and Practical Law content	Web, Microsoft Word, Outlook, and Teams	Research-heavy work where the department already licenses Westlaw
Harvey	Law firms and corporate legal teams	Cited research across legal, regulatory, and tax questions	Web, Word, and Outlook, with SharePoint file sync	Teams evaluating large-document review, contract workflows, and legal research

Vendor facts rechecked October 1, 2026 against each vendor's public site or documentation. Confirm current capabilities and access before you buy.

GC AI

GC AI is built around recurring in-house work: contracts, policies, research questions, and board materials.

Four features support that workflow.

Exact Quote for citations, down to the character of the document you uploaded
Research and US Case Law for primary law
Playbooks for your own standards on NDAs, DPAs, and MSAs
GC AI for Word for where the work already happens

Exact Quote and Research cover two different source checks.

Exact Quote returns the source language behind a contract finding. Research cites primary law for the legal analysis.

Before forwarding an answer, a lawyer can open the cited passage and confirm the finding.

US Case Law runs in the same conversation as the document. A counterparty sends a demand letter, you upload it, ask what the claim rests on, and research the authority behind it without opening another tool.

The research stays attached to the matter. US Case Law is included in Team and Enterprise plans. For Individual seats, it is available as an add-on.

Ritesh Patel, Chief Legal Officer at Viant Technology, described the value of checking cited sources:

Having sources and links right there builds trust. You can check the law yourself, and that trust drives adoption across the team.

GC AI is SOC 2 Type II and SOC 3 certified, GDPR compliant, and uses AES-256 encryption. Its leading AI providers, including OpenAI and Anthropic, do not train on customer data, and GC AI maintains zero-data-retention agreements with its LLM providers wherever feasible.

See GC AI's subprocessor list and data security guide. The Individual plan costs $500 a month for one seat; team pricing is on request, and the 14-day trial starts without a sales call.

Test GC AI on your team's contracts, policies, research questions, and board materials. Our best legal AI tools for in-house counsel guide compares the broader category.

ChatGPT Enterprise

ChatGPT Enterprise gives a company a general assistant; legal supplies its own rules.

OpenAI says it does not train on Business, Enterprise, or API data by default. ChatGPT Enterprise provides retention controls and SAML single sign-on, according to OpenAI's enterprise privacy page, updated January 8, 2026.

OpenAI includes the base GPT-6 Astra model in its Enterprise rollout, subject to administrator enablement. Astra for Law adds legal search and instructions through a separate access program. ChatGPT for Word supports proofreading, suggested edits, and formatting checks; confirm the model and tools enabled in the add-in.

This fits a company already standardized on ChatGPT Enterprise, with legal owning prompts, governance, and verification. Our guides cover ChatGPT privacy, confidentiality, and GC AI vs ChatGPT workflows.

Astra for Law

Eligible firms can test OpenAI's legal research configuration. Its Legal Search Index covers U.S. cases, statutes, regulations, court rules, and administrative decisions. OpenAI tells users to review answers and citations before relying on them.

Corporate legal teams should confirm direct-access eligibility before planning a deployment.

The GC AI ChatGPT Plugin is separate. Where available, it brings GC AI's legal intelligence into ChatGPT. Confirm the enabled models and tools separately from Astra for Law access.

Claude for Legal

Claude for Legal gives teams configurable legal plugins and connectors. Anthropic expanded the original Legal plugin in May 2026 to 12 practice-area plugins and more than 20 connectors, published under Apache 2.0 on GitHub.

Anthropic's README says outputs are drafts for attorney review, setup takes 10 to 20 minutes per plugin, and citations need a connected research tool before verification.

The repository is free to install. Plugin skills and commands work in Claude web chat, Desktop Chat, Cowork, and Claude Code; hooks, sub-agents, and local MCP servers run in Cowork and Claude Code. Anthropic also provides Managed Agents API deployment templates and legal skills for Microsoft 365. Chat and Cowork plugin use requires a paid Claude plan; connectors may require separate subscriptions.

This route fits teams already using Claude if a lawyer will own the practice profile, research connection, and review.

Our Claude for legal work guide covers privilege and Word, including Claude for Word. GC AI vs Claude compares the platforms.

CoCounsel

CoCounsel combines Thomson Reuters legal content with an agentic workspace for research and drafting. It uses Westlaw, Practical Law, and an organization's own knowledge, with linked citations.

Thomson Reuters relaunched the product as CoCounsel Legal in August 2025, around agentic workflows and Deep Research.

It runs in Word, Outlook, and Teams, and it serves law firms and corporate legal departments. A department with Westlaw or Practical Law already in place can use CoCounsel when research is the deliverable.

GC AI vs CoCounsel compares their in-house workflows.

Harvey

Harvey serves law firms and corporate legal teams across contract review, research, and large document sets. Its product suite includes Vault for bulk document review, Knowledge for cross-domain research, Agents for configurable legal workflows, and Contract Intelligence for negotiation and review. Harvey integrates with Word and Outlook and syncs files from SharePoint.

Harvey routes pricing through its sales team, so request a current quote before comparing total cost. Evaluate it if your team needs large-document review alongside contract workflows and legal research.

For GC AI vs Harvey, compare GC AI's Playbooks and Exact Quote document checks with Harvey's configurable Agents and Vault bulk review. Run the same agreement and source set through each, then compare the cited findings, proposed changes, and corrections your lawyers need to make.

What About a Custom GPT for Legal Work?

A custom GPT lets your team reuse instructions, output formats, and reference material inside ChatGPT.

That can standardize a review, while permissions, retention, source checking, and Word functionality depend on the workspace and connections you configure.

The GC AI platform carries company context across matters:

Files and Projects keep document collections and matter context across chats
Exact Quote connects a finding to the source language
GC AI for Word runs review and redlining inside the document
GC AI's data processing agreement and public subprocessor list document data terms and service providers

Our legal AI classes teach prompting skills that lawyers can apply across AI systems.

Test GC AI on Your Own Contracts

For recurring in-house research, contract review, and drafting, start with GC AI.

Trisha Mauer, VP of Legal at Tonal, compared the two directly:

I go straight to GC AI for everything from research requests to litigation responses. I've compared against ChatGPT, GC AI gives more comprehensive responses appropriate for a lawyer to use. After six months of use, I'm sure I've saved hundreds of hours.

Use the same documents and instructions in GC AI and the ChatGPT setup you can access. Open the sources, then record the corrections each answer needs.

Alexandra Sepulveda, then Assistant General Counsel at Trust & Will, put it in budget terms:

If you only have a budget for one tool, choose the one fine-tuned for in-house legal.

The In-House Legal Bench, which GC AI ran in May 2026, scored 100 in-house tasks against attorney-developed answer keys. GC AI passed 86.8% of the answer-key criteria; ChatGPT (GPT-5.5) passed 79.8%. Astra for Law, the base GPT-6 Astra model, CoCounsel, and Harvey were outside that test.

Run a one-hour test on a reviewed vendor NDA:

Open the NDA in GC AI for Word and run the pre-built NDA Playbook: the review returns each flagged term with the clause quoted and a fallback proposed.
Open one Exact Quote citation, confirm the source language, and decide whether the fallback holds.
Ask the NDA's research question. Research should return primary law with citations you can open.
Compare the redline to the one your team sent, and count what the platform caught, missed, or over-flagged.

Use the results to decide which setup deserves a broader test on your team's contracts.

The same review runs inside Word:

GC AI review in Word

Frequently Asked Questions

Is There a ChatGPT for Legal?

Yes. Astra for Law is OpenAI's legal offering, initially available to selected law firms through Trusted Access. Confirm eligibility separately from your organization's existing ChatGPT subscription.

Is ChatGPT Safe for Contracts?

ChatGPT can support contract work when the workspace, connected services, and use comply with your organization's confidentiality and privilege requirements. OpenAI says it does not train on Business or Enterprise data by default; counsel still needs to approve retention, access, and contractual terms and verify the output. Is ChatGPT Confidential? explains the questions to check.

What Is the Best Legal Version of ChatGPT for In-House Counsel?

GC AI is our recommendation for in-house counsel who need Playbooks for company positions, Exact Quote citations to their own documents, and review inside Word. Evaluate it on a contract your team has already reviewed, and compare the sources, proposed changes, and lawyer review needed to finish the work.

Is There a Free Legal Version of ChatGPT?

OpenAI has not announced a generally available free Astra for Law plan. Free ChatGPT can answer legal questions, while Anthropic's legal plugins in Claude Cowork require a paid Claude plan. GC AI offers a 14-day trial, including GC AI for Word.