Biography|Arthur Mensch — Mistral AI Was Registered at 15 Rue des Halles

On 28 April 2023 a new SAS named Mistral AI began activity in Paris.

The commercial register later recorded the seat at 15 rue des Halles, in the 1st arrondissement, a short walk from the Forum des Halles and Châtelet.

Arthur Hubert Jean Mensch was named président. Guillaume Lample and Timothée Lacroix were named directeurs généraux. The SIREN is 952 418 325. Immatriculation at the Paris RCS followed on 12 May 2023.

The address is a domiciliation, not a laboratory. Number 15 sits on a street of shops, exhibition rooms and mailbox offices. The models were trained elsewhere.

A visitor who comes looking for a glass campus will not find one. The honest object on this pin is a legal birth notice on a market street.

Five months later, on 27 September 2023, the company released Mistral 7B under the Apache 2.0 licence and put the weights on a torrent and on Hugging Face.

The blog post that day said the model was the product of three months of work after the team assembled.

That is the sequence: leave DeepMind and Meta in the spring, file the company beside Les Halles, ship an open 7-billion-parameter model before autumn ended.

The seed round in June 2023, at a reported 105 million euros, is a separate fact. It does not live on this pavement.

Rue des Halles is public. Look at the street, read the plaque history of the old drapers' pavilion that once stood at number 15, and do not treat a domiciliation as a workplace tour.

Photo: Celette, CC BY-SA 4.0, via Wikimedia Commons (17 rue des Halles, the next door on the same street). Portrait: Slush, CC BY 4.0, via Wikimedia Commons