Swiss open model Apertus 1.5 lands in Proton's Lumo, reaching tens of millions
valentina__py · x · 2026-09-17
Apertus, the fully open language model built by EPFL, ETH Zurich and CSCS, is partnering with Swiss privacy company Proton to ship Apertus 1.5 inside the Lumo AI assistant, making it available to tens of millions of users.
Key points:
- Lumo users can pick Apertus 1.5 as their model; chats stay encrypted.
- Users can opt to donate anonymised feedback, giving the research team real-world user feedback — a step open models rarely get.
- Both sides frame it as a move toward Swiss/European digital sovereignty and open AI.
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