Proton · 2× · vu le 20 juil. 2026
Lumo is a conversational AI chatbot by Proton AG (Switzerland), originally released on July 23, 2025, and subsequently updated multiple times (most recently version 2.0 in June 2026). The product positions itself as a privacy-oriented alternative to mainstream chatbots: conversations are stored with Zero-Access encryption, no logs are kept, and user content does not flow into model training according to the provider. Behind the scenes, Lumo uses a rotating system of open-weight language models (some marketed as "Open Source"), such as Mistral Nemo, OLMO 2, and OpenHands 32B, and is available via web and iOS/Android apps. However, independent auditors (such as the European Open Source AI Index) criticize that training data, model weights, and Arc
