Grounded Legal Research in ChatGPT: CourtListener Joins ChatGPT Enterprise
Free Law Project's CourtListener plugin in ChatGPT is now available, giving lawyers grounded, verifiable access to case law and PACER data inside the AI tools they already use.
The plugin connects ChatGPT to CourtListener's full legal research platform: case law records, federal court filings from the RECAP Archive, citation networks, oral argument transcripts, case and query alerts, and more. It already works with any client that speaks the Model Context Protocol, and is now available as a ChatGPT plugin.
Giving an AI assistant access to these resources unlocks research that used to be done by hand:
- A litigation team can ask an assistant to surface and summarize every circuit split on a doctrine.
- An attorney can verify every citation in an incoming brief against primary sources before it goes out the door.
- A team tracking dozens of cases can set alerts for when any of them cite specific case law.
Every result links back to the underlying documents, grounding answers in primary-source legal data that lawyers can review and verify. Setup instructions and full documentation are on Free Law Project's wiki.
Double API access through October 1
To celebrate, we're doubling CourtListener's API rate limits for everyone for the next two weeks. The higher limits apply automatically to everything that uses the API, including the ChatGPT plugin. If you find yourself hitting them, membership raises your limits permanently.
The ChatGPT plugin means more legal professionals can find their way to free, open court data inside the tools they already use every day. That is exactly the kind of reach Free Law Project's open infrastructure was built to make possible.
“ChatGPT is the most popular AI agent in the world and is where millions of people are already asking legal questions. Today’s announcement helps us achieve our mission of bringing high-quality legal research tools to everybody,” said Michael Lissner, Executive Director of Free Law Project.
“We believe the next generation of AI for law will be built around what makes each firm distinctive - its expertise, judgment, and way of working. By building alongside Free Law Project, we’re turning that expertise into AI lawyers can use every day, creating new ways for firms to serve their clients and shape the future of legal work.” - Jason Boehmig, GM Legal Industry at OpenAI
What's next?
The CourtListener plugin is one more way CourtListener's data can reach lawyers and litigants as they do their research. We plan to keep expanding the MCP server's tools, and if you're building on it, we want to hear what you need.
Legal teams interested in connecting CourtListener to their own AI tools can find setup details in the CourtListener MCP documentation, become a member to increase their API access, or make a donation to support free and open access to the law.
