What is Apertus?
Apertus (Latin for "open") is Switzerland's first large-scale open-source language model, developed by EPFL, ETH Zurich and the Swiss National Supercomputing Centre (CSCS).
"With this release, we aim to provide a blueprint for how a trustworthy, sovereign, and inclusive AI model can be developed."
— Prof. Martin Jaggi, EPFL
Apertus includes underrepresented languages like Swiss German and Romansh. Available in two sizes (8B and 70B parameters), the model is fully open-source with architecture, weights, training data and recipes publicly accessible.
Built for Public Good
Apertus is not a conventional case of technology transfer from research to product. It's a driver of innovation designed to strengthen AI expertise across research, society and industry. The model is regularly updated by a specialized team of engineers and researchers from CSCS, ETH Zurich and EPFL.
Why Host Apertus With Us?
Optimized for Apertus
Configurations specifically designed to run Apertus 8B and 70B with vLLM, Transformers, SGLang or MLX
Swiss Sovereignty
Your data and models stay in Switzerland, compliant with Swiss data protection laws, GDPR and the EU AI Act. Trustworthy and sovereign infrastructure.
Fast Inference
Ultra-low latency for instant Apertus responses in production
High-Performance GPUs
Professional GPUs with 24GB to 80GB+ VRAM to run Apertus 8B and 70B with extended context windows
100% Open Source
Full access to model weights, training data and recipes via HuggingFace
Multilingual
Native support for 1000+ languages including Swiss German, Romansh and underrepresented languages
Technical Specifications
Apertus 8B
- • 8 billion parameters
- • Recommended VRAM: 24GB+
- • Ideal for individual use
- • Fast deployment
Apertus 70B
- • 70 billion parameters
- • Recommended VRAM: 80GB+
- • Maximum performance
- • Enterprise applications
Supported Deployment Frameworks
Model Access
Apertus is freely available under a permissive open-source license for educational, research and commercial applications:
- • Model weights: HuggingFace Collection
- • Chat interface: PublicAI.co
- • Complete documentation, source code and training recipes available
Apertus Applications
Multilingual Chatbots
Build conversational assistants supporting French, German, Swiss German, Italian and Romansh
Translation Systems
Develop translation tools for underrepresented languages with Apertus
Educational Tools
Create language learning applications and educational assistance tools
Document Analysis
Process multilingual documents with advanced contextual understanding
Custom Fine-Tuning
Adapt Apertus to your specific needs with your own training data
Research & Innovation
Experiment with a transparent and reproducible model for your research projects