Swiss higher education institutions support open access. The Swiss National Science Foundation requires grantees to make their work open access as of 2020, either in the gold or the green road, possibly after an embargo period of 6 or 12 months. It also offers grants to cover APCs (Article-Processing Charges), to publish in gold OA journals. But it does not cover the costs of publication in "hybrid journals" (subscription journals with an OA option).
On June 1st, 2022, the SNF has announced that it is joining cOAlition S and will, on January 1st, 2023 at the earliest, implement plan S. It means that researchers funded by the SNF will have to publish their journal articles open access immediately, and there will be no possibility of a 6-month embargo anymore. It is also planning to introduce the CC BY licence as a standard feature for journal articles.
According to the Swiss National Strategy on Open Access, adopted in 2017, all publicly funded research in Switzerland should be open-access in 2024.