Apertus 1.5 extends our fully open models with image understanding, a thinking mode, and a four times longer context window. Visit our documentation site for details, and use the @swiss-ai organization on Hugging Face for downloading the official weights.

Community Showcase

Visit the Get Started page for a list of inference providers. Our Quickstart has technical information on downloading Apertus models to your own computer, and on how to contribute. The following applications have been built with Apertus:

Public AI Switzerland

A chat interface you can use for free. Login for access to open models, web search, and more.

ZüriCityGPT OSS

A RAG Chatbot demo developed by Liip to ask questions about city laws with the Apertus model.

Helvetra

Translation service powered by Apertus. Simple, private, precise. Built in Switzerland for everyone who values their words.

AI Potluck

A coalition of organizations that share what gets built: a foundation model, fine-tuning capabilities, a benchmarking framework, safety tools, funding.

Would you like to see your Apertus project here? Let us know.