§ Art. OR StGB
BGEx
Contact
EN
DeutschFrançaisItalianoEnglish
Open BGExOpen

Connect your AI to over 1.5 million legal documents

  • Case law, statutes, drafting history, literature, companies – verbatim, with links.
  • Your AI reads the source itself instead of quoting from memory.
  • Your conversation stays with your AI; BGEx only sees what it looks up.
  • Free, no account, no key.
Connect ClaudeChatGPTLe ChatGrok

One click, then confirm the connection in Claude.

  • 2× as many requested cantonal decisions found as without BGEx1
  • 100% of requested citations found1
  • 100% of requested considerations found1
  • No hallucinated citations, after checking at the source1

What your AI does better with BGEx

  • Wording, not memory

    Your AI reads the consideration exactly as the court wrote it, and every result carries the link to the passage on bgex.ch.

  • Check citations

    Up to 10 citations at once: do the decision, the consideration and the article exist, and what do they say?

  • Federal and cantonal courts

    The Federal Supreme Court with new judgments every day, plus the Federal Administrative, Criminal and Patent Courts and decisions of cantonal courts.

  • Materials, literature, agency practice

    Federal law, dispatches and parliamentary debates, legal literature, plus the published practice of ESTV (circulars, VAT info), FINMA, BSV, SEM, WEKO, EDÖB and EHRA.

  • Success rates at the Federal Supreme Court

    How often appeals succeeded, by area of law, type of appeal and canton, with the number of decisions and the period.

  • Queries only, never your chat

    BGEx receives only your AI’s queries, not your conversation, and writes them into no log of its own.

Which AI do you use?

Claude

Connect Claude

  1. Click «Connect Claude» above. Claude opens BGEx; sign in if asked.
  2. In Claude, click the black button to connect.

When it has worked

BGEx is now connected to Claude.

Try it. Ask Claude in a chat:

Use BGEx: what does the Federal Supreme Court say about summary dismissal?

If Claude asks whether it may use BGEx, choose to allow it permanently: that is the light button, left of the black one. BGEx only reads; it changes nothing.

BGEx is then also connected in the Claude app on your phone.

ChatGPT

  1. Open in your browser: chatgpt.com/plugins
  1. Click «+».
  2. Choose «Add custom MCP server».
  1. Type the name: BGEx
  2. Paste the address under «Connection»: https://bgex.ch/api/mcp
  3. Choose «No authentication».
  4. Tick «I understand and want to continue».
  5. Click «Create as a plugin».
  1. Click the button to connect BGEx.

When it has worked

BGEx is now connected.

Try it. Type «@» in a chat, choose BGEx and ask:

Use BGEx: what does the Federal Supreme Court say about summary dismissal?

Depending on your plan; set it up in the browser only.

Le Chat

by Mistral, “Vibe” at the top left of the app

  1. Open Le Chat.
  2. Click «Connectors» in the sidebar.
  1. Click «+ Add Connector».
  2. Choose «Custom MCP Connector».
  1. Type under «Connector name»: BGEx
  2. Paste the address under «Server URL»: https://bgex.ch/api/mcp
  3. Click «Connect».

When it has worked

BGEx is now added.

Try it. Ask Le Chat:

Use BGEx: what does the Federal Supreme Court say about summary dismissal?

This works on the free plan too.

Grok

by xAI

  1. Open Grok.
  2. Click your profile at the bottom left.
  3. Open the settings.
  1. Click «Connect Apps» on the left.
  2. Click «Add a custom connector» at the very bottom.
  1. Type BGEx as the name.
  2. Paste the address as the server URL: https://bgex.ch/api/mcp
  3. Leave the headers empty.
  4. Click the button that adds the server.

When it has worked

BGEx is now added.

Try it. Ask Grok:

Use BGEx: what does the Federal Supreme Court say about summary dismissal?

This works on the free plan too.

In your personal instructions

To have the AI use BGEx on its own, copy this line into your personal instructions: in Claude under «Settings › Profile», in ChatGPT under «Personalization › Custom instructions».

For questions on Swiss law, use the BGEx connector.

Not working?

  • The link does not open BGEx in Claude? Add BGEx as a custom connector: claude.ai/customize/connectors › «+ Add» › «Add custom connector», name BGEx, address https://bgex.ch/api/mcp, «No sign in».
  • An error when connecting? Choose «No sign in» (Claude) or «No authentication» (ChatGPT) and paste the address without spaces.
  • The AI answers without BGEx? Start your question with «Use BGEx»; in ChatGPT, first type «@» and choose BGEx.

Frequently asked questions

What is a connector?

A connector gives your AI a tool: while it answers you, it searches and reads in BGEx itself. Technically it is an MCP server.

What does it cost?

Nothing. BGEx needs no account and no key. The number of requests per day is limited; when the limit is reached, the connector says so. A new day starts at midnight (Swiss time).

Which plan do I need?

In Claude, Le Chat and Grok it also works on the free plan. In ChatGPT it depends on the plan.

What does BGEx see of my conversation?

Only the requests your AI sends to BGEx: search terms and filters, citations, statute articles. The conversation itself stays with the AI. BGEx sets no cookie and writes the requests into no log of its own.

Can BGEx change anything?

No. The connector only reads and changes nothing. In Claude you can therefore always allow it.

More about the connector

What the connector returns

  • Search — decisions of the Federal Supreme Court (BGE and other judgments) by keywords, statute article or citation; up to ten hits, each with citation, date, headnote or beginning, and link.
  • Overview — for one decision the citation, date, headnote, the beginning of the facts and the operative part, and every consideration with its first words.
  • Excerpts — the consideration that answers the question, in its original wording. The full decision is on bgex.ch.
  • Statute articles — federal law in the version in force, unchanged from Fedlex, with marginal title and footnotes.
  • Further courts (KantEx) — with «kantex_suche» the AI finds decisions of the cantonal courts and of the Federal Administrative, Criminal and Patent Courts (up to 10 hits with excerpt and link); with «kantex_entscheid» it reads the text of a decision.
  • Agency practice — with «praxis_suche» the AI finds the published practice of ESTV (circulars, VAT info), FINMA, BSV, SEM, WEKO, EDÖB and EHRA (up to 10 hits with citation, status and link); with the id it reads the text.
  • Legislative materials (MatEx) — with «matex_suche» the AI finds the Confederation’s dispatches, reports, parliamentary debates and consultations; with «matex_eintrag» it reads dispatches, reports and debates in their wording, from a page, section or speech (German version in the Federal Gazette, Official Bulletin). For consultations and scans before 1999, BGEx gives the details with a link.
  • Legal literature (LiterEx) — ask for articles, books or commentaries on a topic. BGEx gives the citation and link, and the abstract where the licence allows.
  • Success rates — with «chancen» the AI gives the success rates of appeals to the Federal Supreme Court by area of law, type of appeal and canton, with the number of decisions and the period, like the Chancenrechner on bgex.ch (in German). These are rates of past decisions, not a forecast for an individual case.

Everything is the original wording; BGEx summarises nothing. Every answer carries the link to the passage on bgex.ch, so you can check and cite it.

Plans and settings

  • Claude — on every plan; the free plan allows one custom connector. Then also in the mobile app. Team and Enterprise: an admin adds BGEx once, then each member connects with one click.
  • ChatGPT — custom MCP servers depend on your plan and run in the browser. Every BGEx call can be expanded in the answer.
  • Le Chat — free plans included; on Team plans an admin adds the connector. The tools can be allowed one by one.
  • Grok — free plans included.

Limits

The connector only reads. It changes nothing, knows no accounts and does not hand out whole collections, only excerpts for a question.

The number of requests per day is limited. When the limit is reached, the connector says so; then continue reading on bgex.ch. A new day starts at midnight (Swiss time). An AI that sends very many requests in a short time has to wait briefly.

Privacy

Your AI sends its requests to BGEx: search terms and filters, citations or case numbers of decisions, and statute articles. The AI decides what it asks. BGEx answers the requests without an account and without a cookie and writes them into no log of its own. What you write to the AI and what it does with it is governed by its provider’s privacy policy.

More in the privacy policy.

1 Measured with Claude: 39 questions in 4 languages, each without and with BGEx, 14 November 2026.

Claude, ChatGPT, Le Chat and Grok are trademarks of their owners; BGEx is not affiliated with them.