Model catalogue · Swiss AI Initiative (EPFL, ETH Zürich)
Apertus
Version via EU inference of open models through the Gosign chain: Apertus 70B , model swiss-ai/Apertus-70B-2509 (as of 29 September 2026)
EUR 1.4375 per million tokens as of 12 October 2026
Vendor: Apertus-v1.5-70B, as of 29 September 2026
The most transparent model in this catalogue, developed at ETH Zurich and EPFL: not only the weights are disclosed but the training data and procedures as well - a provenance record that closed models do not offer. Under professional-secrecy law it carries on three routes. Among the open models Gosign hosts itself in Germany, the addendum under section 203 of the German Criminal Code is signed, with instruction on criminal liability and a chain obligation onto the subcontractors. In dedicated operation on reserved hardware the same chain obligation binds the data centre operator. And when running on your own hardware on your own premises no third party participates at all, so the disclosure question under section 203 does not even arise.
Everything section 203 requires is settled, including the provider's confidentiality undertaking, and nothing is stored at the provider, apart from a technical cache of a few minutes for Claude (zero retention). You do not have to clarify anything further.
The operator bills separately - input EUR 1.25 · output EUR 2.00. The figure above is the blend of the two, weighted three quarters input to one quarter output, as it arises in a firm. Charged at the vendor's list price, without a mark-up.
The providers set these prices; they can change at any time, and our figures may contain errors. The list price in force at the time is authoritative.
What it is good for
- Fully disclosed - weights, training data and procedures are evidenced
- Public-academic provenance instead of a vendor black box
- Available through EU inference with a section 203 addendum and in self-operation
Where it stops
- Performance below the large proprietary models
- Case-law citations and references must be verified as a matter of principle
- No legal fine-tuning - the professional assessment stays with the practitioner
Status through us
The same model, procured differently, is a different legal position. The status above refers to procurement through us; processing takes place in Germany.
Which route carries it, with which instrument and under which condition, we set out in full to the firm before it commissions us - section 203(4) requires that the chain can be checked, not that it is published. The full matrix, with the sources behind every route, can be requested in the German catalogue after confirming your e-mail address, and we go through it in the conversation.
Is Apertus the right fit?
We go through your tasks and the route that carries them - and say plainly where it does not.
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