APERTVS.ai
Fully Open Foundation Model for Sovereign AI<br>Developed by the Swiss AI Initiative as a collaborative effort between EPFL, ETH Zurich, and CSCS. Open weights, open data, open science.<br>Get Started<br>Technical Information
Fully Open<br>Training data, code, weights, methods, and alignment principles — all documented and reproducible. Apertus is to AI as Open is to Source.
Compliant at Scale<br>Built to meet EU AI Act requirements: the model respects opt-outs, removes PII, prevents memorization. A global foundation to build on.
Run for Performance<br>Competitive with top open models at an equivalent scale of 8B and 70B parameters. Multilingual from day one — trained on 1000+ languages.
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Jun 15Apertus Mini<br>A set of 16 small language models released to demonstrate distillation and quantization techniques.
Apr 25Apertus paper at ACL 2026<br>Our technical report has been accepted at a leading conference for AI & NLP.
Mar 17Apertus for Ticino<br>Fine-tuned model powers in-house AI translation
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