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Apertus

by Swiss AI Initiative

About the model:

Open-data open-weights models, multilingual in >1000 languages, developed at Swiss public universities.

Model type:

Text

Model performance class:

Full

Link to the model:

https://huggingface.co/collections/swiss-ai/apertus-llm-68b699e65415c231ace3b059

Base models:

Apertus-70B-2509

End model:

Apertus-70B-Instruct-2509

End model license:

Apache-2.0

About the organisation:

Swiss National AI Institute (non-profit research institute) collaboration with Swiss National Supercomputing Centre (CSCS).

Link to the organisation:

https://swiss-ai.org

Model release date:

September 2025

Availability

Base Model Data

Training data for base model released and use documented.

https://github.com/swiss-ai/pretrain-data https://huggingface.co/datasets/epfml/FineWeb2-HQ https://huggingface.co/datasets/swiss-ai/fineweb-2-compliant-tag https://huggingface.co/datasets/swiss-ai/fineweb-compliant-tag

End User Model Data

Data for fine-tuning published in a well-organized manner.

https://huggingface.co/swiss-ai/datasets

Base Model Weights

Model weights available in many stages.

https://huggingface.co/swiss-ai/Apertus-70B-2509/tree/main

End User Model Weights

Model weights available in many stages.

https://huggingface.co/swiss-ai/Apertus-70B-Instruct-2509/tree/main

Training Code

Multiple repos with training, architecture and fine-tuning code available.

https://github.com/swiss-ai/

Documentation

Code Documentation

Repositories and code well-described, commented and documented.

https://github.com/swiss-ai/

Hardware Architecture

Architecture documented in requisite detail.

https://github.com/swiss-ai/apertus-tech-report

Preprint

Preprint version of the paper available here.

https://arxiv.org/abs/2509.14233

Paper

Paper under peer review

Modelcard

Model card provides broad overview and links to full details.

https://huggingface.co/swiss-ai/Apertus-70B-2509/

Datasheet

Data sheets are well-documented and provide requisite info.

https://huggingface.co/datasets/swiss-ai/fineweb-compliant-tag https://huggingface.co/datasets/swiss-ai/fineweb-2-compliant-tag https://huggingface.co/datasets/swiss-ai/fineweb-edu-compliant-tag https://huggingface.co/datasets/swiss-ai/robots-txt-blocked-domains-english https://huggingface.co/datasets/swiss-ai/robots-txt-blocked-domains-multilingual https://huggingface.co/datasets/swiss-ai/fineweb-robots-txt-files-compressed

Access

Licenses

Apache 2.0, an OSI-approved license.

https://huggingface.co/swiss-ai/Apertus-70B-Instruct-2509/blob/main/LICENSE.txt

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