The confidential AI assistant.
Lumo 2.0 is Proton's private AI assistant. Every conversation is end-to-end encrypted, nothing is used for training, and Confidential Thinking keeps reasoning traces out of Proton's own logs. It's the first mainstream assistant that treats privacy as a product feature, not a policy footnote.
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Reasoning happens inside a zero-knowledge boundary — Proton cannot read your prompts or answers.
Prompts, uploads and chats are never used to train models, ever.
Conversations sync across devices end-to-end encrypted — like Proton Mail for AI.
Analyse PDFs, spreadsheets and images without them leaving the encrypted boundary.
Optional privacy-respecting web results — no personalised tracking profile.
Runs on transparent, auditable open-weight models rather than opaque proprietary APIs.
Team accounts inside Proton Business, with the same zero-knowledge guarantees and central billing.
Operated by Proton AG in Geneva under Swiss privacy law — outside US and EU disclosure regimes.
The fastest path to a private AI assistant without losing your existing workflows.
The officially documented upgrades over the original Lumo release, and what each one means in practice.
Lumo runs open-weight models inside Proton's zero-knowledge infrastructure. Nothing you type is used for training, and Confidential Thinking keeps even the reasoning trace private.
Yes — Proton Unlimited bundles Mail, VPN, Pass, Drive, Calendar and Lumo 2.0 for one price.
Yes. A Proton Account includes free Lumo access with usage limits; Lumo Plus lifts those limits and is bundled inside Proton Unlimited.
Lumo is the 'think' layer. Mail and Calendar handle communication, VPN and Pass handle access and credentials, Drive handles files, and Lumo reasons over that work without breaking the encryption model.
Lumo Business is designed for teams and inherits Proton's Swiss jurisdiction and zero-knowledge architecture, which is why legal, finance and healthcare teams choose it over US-hosted assistants.
