ETH Zurich and EPFL are releasing a large language model (LLM) developed on public infrastructure, trained on a supercomputer and open to the public under the Apache 2.0 License. The model is multilingual, capable of understanding over 1,000 languages, and will be released in two sizes. The development of this model is part of the Swiss AI Initiative, a collaboration between multiple Swiss universities and institutions. The model's training data will be transparent and reproducible, but not entirely publicly available due to copyright and distribution limitations.