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Research Switzerland

Apertus partners with Proton's Lumo AI assistant

Researchers from EPFL, ETH Zurich, and CSCS have partnered with Swiss company Proton to integrate the open‑source language model Apertus 1.5 into Proton’s AI assistant Lumo. The collaboration allows Apertus developers to receive voluntary, anonymised user feedback from millions of Lumo users, a first for an open model. The partnership also supports Switzerland’s goal of AI sovereignty by providing a competitive, privacy‑focused alternative to foreign chatbots.

Published
17 Sept 2026
2 min read 1 source
Intelligence brief
Switzerland / Research
CH

Researchers from EPFL, ETH Zurich, and CSCS have partnered with Swiss company Proton to integrate the open‑source language model Apertus 1.5 into Proton’s AI assistant Lumo. The collaboration allows Apertus developers to receive voluntary, anonymised user feedback from millions of Lumo users, a first for an open model. The partnership also supports Switzerland’s goal of AI sovereignty by providing a competitive, privacy‑focused alternative to foreign chatbots.

Why it matters

It strengthens Swiss AI sovereignty by enabling an open, privacy‑focused model to be tested and improved with real‑world user data, supporting the development of a competitive domestic AI ecosystem.

Primary source record
EPFL News

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