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Apertus: A Fully Open, Transparent, Multilingual Language Model
Apertus supports over 1,000 languages, with 40% non-English data, emphasizing transparency, ethical compliance, and public accessibility under an open-source license.
- On September 2, 2025, EPFL , ETH Zurich and the Swiss National Supercomputing Centre , Lugano released Apertus, a fully open, multilingual LLM emphasizing transparency and legal compliance.
- Framed as public infrastructure, the project provides open code and datasets, and developers published documentation, model weights, and training recipes under an Apache 2.0 license enabling reuse.
- Trained on 15 trillion tokens across more than 1,000 languages with around 40% non-English data, Apertus includes Swiss German and Romansh and offers 8 billion- and 70 billion-parameter models.
- At upcoming Swiss AI Weeks hackathons, developers, businesses and students will test Apertus and provide feedback, while Swisscom hosts the model on its sovereign Swiss AI Platform with a dedicated interface.
- Built on carbon-neutral energy using the Alps supercomputer at the Swiss National Supercomputing Centre in Lugano, the project stresses compliance with Swiss data protection, EU AI Act, robots.txt, and privacy filtering while planning domain-specific expansions for law, climate, health, and education.
17 Articles
17 Articles
Switzerland launches its own open-source AI model
There's a new player in the AI race, and it's a whole country. Switzerland has just released Apertus, its open-source national Large Language Model (LLM) that it hopes would be an alternative to models offered by companies like OpenAI. Apertus, Latin for the world "open," was developed by the Swiss Federal Technology Institute of Lausanne (EPFL), ETH Zurich and the Swiss National Supercomputing Centre (CSCS), all of which are public institutions…
ETHs in Zurich and Lausanne have published a new AI language model. It can also be Swiss German.
The new artificial intelligence from Switzerland should score with multilingualism – and with solid legal foundations.
Switzerland Launches ‘Apertus’, Its National Open-Source LLM
New York Switzerland entered the AI race with the launch of a national Large Language Model (LLM) named ‘Apertus’, intending to gain sovereign AI infrastructure as an alternative to American and Chinese dominance. The model was developed by specialized engineers and a large number of researchers of ETH Zurich, the Swiss Federal Institute of Technology Lausanne (EPFL), and the Swiss National Supercomputing Centre (CSCS). The model’s name, ‘Apertu…
Switzerland releases its own fully open AI model – #CryptoUpdatesGNIT
A group of Swiss institutions has released a new open AI model, designed to serve as a foundation for future research and applications. Built by EPFL, ETH Zurich, and the Swiss National Supercomputing Centre (CSCS), the model is called Apertus – Latin for “open.” The name reflects its core principle: every part of its design and training process is accessible to the public. Developers and organisations can use Apertus to create chatbots, transla…
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