Majorie
Swiss law,
brought together and made intelligible
A language model dedicated to Swiss law, built on Apertus — the open LLM developed in Switzerland by EPFL and ETH Zurich. Trained exclusively on official texts, to reason about the law with precision, traceability and respect for sources.
Origin of the name
Where does the name Majorie come from?
In the Middle Ages, the Major (*maior* in Latin — the chief, the principal) was an officer serving the Bishop of Sion, invested with low-justice judicial authority in the valleys of Valais. By extension, « la Majorie » came to designate the castle owned by the major, before it was purchased by the Bishop of Sion in 1373.
The original tower is attested from 1221. Purchased by the bishop in 1373, the castle served for more than four centuries as the residence of the prince-bishops and the heart of episcopal power in Valais, until the fire of 1788 which destroyed the diocesan archives.
Majorie revives this name with the same ambition: to make Swiss law accessible, traceable and understandable — for today's practitioners, as for the systems that will assist them tomorrow.
At the origin
A 100% Swiss model for Swiss law
Majorie is a language model project specialised in Swiss law, built on Apertus — the open LLM developed by EPFL and ETH Zurich with CSCS. To train it, we have built the largest non-proprietary Swiss legal corpus. The search platform was born from a simple idea: put this corpus to work right now — for practitioners who need it, and to fund the rest of the project.
Learn more about ApertusSwiss foundations
Apertus, an open-weight LLM designed and trained in Switzerland (EPFL / ETH Zurich / CSCS).
Swiss data
Training corpus: 918,569 indexed documents, 21 / 26 cantons, three official languages.
Swiss hosting
Infomaniak infrastructure (Public Cloud). No data leaves the territory.
The corpus
The most complete Swiss legal corpus
A non-proprietary corpus, built source by source from official collections.
919k
documents collected
684 Go
of raw data
21 / 26
cantons covered
1,227
municipalities indexed
Roadmap
Project milestones
Build the foundations
Dedicated scraper, 918,569 official legal documents extracted — 21 / 26 cantons, three languages.
Make the law searchable
Launch of majorie.ch: the whole corpus accessible to practitioners, with subscriptions and firm-level spaces.
Train a dedicated model
Fine-tuning of Apertus on the Swiss legal corpus, for a trilingual model that cites its sources and reasons with rigour.
Deploy in sovereignty
Dedicated model for firms, administrations and institutions — API, on-premise, DMS integrations.
Behind the project
A project led directly
Majorie is a project developed by Nicolas JULIEN, an independent developer based in Sion, Switzerland.
The project was born from a passion for AI and the training of specialised models. Swiss law emerged as a natural ground: a rich corpus, three official languages, and requirements for exact citation that generalist models struggle to meet.
Building a sovereign legal model takes time, data, and real patience. Majorie is this workbench — accessible today as a search platform, and on its way to what it may become.