Technical Information

See our Research collection for an in-depth look at the architecture, training, data mix, and evaluation results. The Frequently Asked Questions cover many common issues.

Apertus 1.5 Usage Policy

Terms and conditions for model use

Apertus Charter

The values and principles that guide Apertus

EU Public Summary

Public summary for EU AI Act compliance

EU Code of Practice

Code of practice documentation

Download the official swiss-ai releases from the Apertus team:

Apertus 1.5 8B

8 billion parameters · Apache 2.0

Download → Hugging Face

Apertus 1.5 70B

70 billion parameters · Apache 2.0

Download → Hugging Face

Apertus 1.1 Mini

0.5, 1.5, 4 billion parameters · Apache 2.0

Download → View collection

Apertus 1.0

8, 70 billion parameters · Apache 2.0

Download → View collection

Code Base

Swiss AI on GitHub

Training code, evaluation scripts, and model artifacts for Apertus and related projects.

Pre-Training Data

Scripts for reconstructing the training dataset.

Apertus Format

Python library for the custom chat format.

Fully open training infrastructure. We look forward to hearing about your efforts to build on our models!