Check legal citations in ChatGPT with Loupe.

Connect Loupe

1. Open Loupe Citation Checker in ChatGPT and install or connect it.
2. When ChatGPT sends you to Loupe, sign in with your email and read the permissions before choosing Allow.
3. Add Loupe to the conversation from the tools menu and ask it to check a passage or draft.

Availability depends on your ChatGPT account and workspace settings. For manual MCP setup, the server is https://loupe.legal/mcp; your account’s Connections tab has the setup details. Prefer the published directory entry when it is available.

A question to try

Use Loupe to check whether 550 U.S. 544 is the citation for Ashcroft v. Iqbal. Show the authority Loupe found, its sources and anything not checked.

The demonstration on the homepage shows this question in ChatGPT and Claude. The draft and explanation belong to the assistant; the verification result comes from Loupe.

What the result means

A mismatch is a specific conflict with the source. Not verified means the lookup could not settle the question, not proof that a case is fabricated. Read the sources and the checks that did not run.

Quotation checks and saved work require a Loupe account, free while Loupe is in testing. Loupe does not check whether a case remains good law or whether it supports a proposition.