Proton steps into AI with Lumo, a secure and private chatbot

Proton’s launch of lumo

Proton recently introduced its first AI chatbot, Lumo, expanding beyond its well-known encrypted services like Proton Mail and Proton VPN. Lumo was built with the same focus on user privacy, making it a unique option compared to mainstream chatbots.

It can summarize text, draft emails, provide coding help, and answer questions. The chatbot is available on mobile and web platforms, allowing users to interact securely while keeping their personal information private and protected.

Zero-access encryption ensures privacy

Lumo uses a zero-access encryption system to safeguard user interactions. This design means that conversations are encrypted so that even Proton cannot access or view the data. Only the user can decrypt and read their stored chats.

This model ensures that sensitive information remains inaccessible to third parties, including governments, advertisers, and the platform. It sets Lumo apart from many other AI tools that may store or review conversations.

No logging or data usage for training

Unlike other AI platforms, Lumo does not log user conversations or use them to train its models. Messages remain confidential and are never reused for machine learning improvements.

This approach reduces the risk of misusing sensitive information, while giving users peace of mind that their private discussions are not being stored or shared.

Proton’s long-standing stance on privacy carries over to Lumo, allowing it to provide helpful AI assistance without sacrificing user confidentiality or data safety.

Open-source models behind lumo

Open-source language models power Lumo, which was developed outside of Big Tech companies. Proton uses a range of openly available LLMs, including Mistral’s Nemo and Mistral Small 3, Nvidia’s OpenHands 32B, and OLMO 2 32B, which run exclusively on its own servers.

By relying on open-source technology, Proton brings transparency and avoids the black-box systems used by many competitors.

This ensures users can trust that the chatbot operates with security and accountability, offering a clearer picture of how the technology functions and where the data is being processed.

European server infrastructure

Lumo operates on Proton’s European-based servers, primarily in Germany and Norway. Hosting the service in Europe helps the company avoid weaker privacy protections found elsewhere while ensuring compliance with strict regional data protection standards.

This decision reflects Proton’s response to proposed surveillance law changes in Switzerland, while the company continues operating there, Lumo is hosted primarily in Germany (and expanding in Norway) to ensure strong privacy protections under EU jurisdictions.

Integration with proton ecosystem

Lumo integrates smoothly with Proton’s existing ecosystem of secure tools. For example, users can allow it to work with files stored in Proton Drive, enabling the chatbot to analyze or summarize documents without compromising encryption.

This creates a unified experience across Proton services, where data remains protected at every step. By extending its privacy-first approach to AI, Proton allows users to benefit from productivity and convenience while staying within the same trusted, encrypted environment they already rely on.

Optional web search with privacy in mind

Lumo can perform web searches to improve answers, but this feature is turned off by default. When enabled, the chatbot only uses search engines that respect user privacy, keeping personal information secure even when connecting to outside resources.

This approach gives users flexibility without forcing them to compromise their data. Those who want quick access to online information can enable the function, while privacy-conscious users can leave it off and continue relying on Lumo’s local AI capabilities.

Performance improvements over time

Proton has reported substantial improvements in Lumo’s performance during its early testing phases. The chatbot’s ability to understand complex context has increased significantly, along with better coding and reasoning task accuracy.

These upgrades make responses more precise and more reliable for everyday use. The focus is on providing accurate and efficient answers rather than overly creative responses, aligning with Proton’s goal of balancing usefulness with privacy.

Usability across platforms

Lumo is available on both desktop and mobile, making it accessible from a web browser or through dedicated apps for iOS and Android. This cross-platform design ensures users can take advantage of private AI assistance wherever they are.

The interface is simple, focusing on secure interactions rather than flashy design. Proton aims to make the chatbot practical for everyday use while ensuring the same level of encryption and protection on every platform.

Cautious creativity versus ChatGPT

Compared directly with ChatGPT, Lumo often provides less creative but more careful answers. Its design focuses on accuracy and privacy rather than imaginative or experimental responses.

This cautious approach ensures that users receive reliable and straightforward outputs, especially for tasks like summarizing, writing drafts, or checking information.

While it may not excel at storytelling or generating highly original text, Lumo prioritises correctness and data protection, which appeals to users who value security above entertainment.

Tiered usage plans

Proton offers both free and paid versions of Lumo. The free plan includes a limited number of weekly prompts and basic features, which are available even to users without a Proton account.

For heavier use, the paid Lumo Plus subscription provides more generous allowances, including unlimited conversations, an extended chat history, and the ability to handle larger files.

Proton’s motivation and vision

Proton’s leadership has described Lumo as an alternative to mainstream AI tools that often collect and exploit data. The company believes artificial intelligence should serve individuals without feeding into surveillance or advertising models.

Lumo is a practical step toward that vision, offering beneficial AI without hidden costs to privacy. Proton sees the chatbot as a competitive product and a statement of principles, aligning with its long-standing mission of protecting digital rights worldwide.

Architecture challenges in encrypted AI

Designing an encrypted AI assistant comes with unique challenges. Proton needed to balance performance with strict privacy safeguards, since advanced methods like fully homomorphic encryption are still too slow for everyday use.

Instead, the company built a model that uses strong encryption during data transmission and storage while keeping the process seamless for users. This architecture allows Lumo to respond quickly and effectively while ensuring personal data remains private, demonstrating that encrypted AI can still be practical and responsive.

Transparency through encryption models

Proton has built Lumo around a straightforward two-step encryption process. Conversations are first encrypted during transmission, preventing outsiders from intercepting messages. Then, stored data is locked with zero-access encryption, meaning only the user can decrypt it on their device.

Proton itself cannot view these chats at any point. By combining these protections, Lumo ensures security from end to end. This approach is automatic and invisible to the user, delivering privacy by default without requiring technical knowledge or setup.

Privacy compliance and european base

Operating from Europe allows Lumo to function under some of the world’s strongest privacy laws. Regulations like the General Data Protection Regulation provide strict guidelines on handling data, offering users additional confidence.

Proton’s choice to host its servers in Germany and Norway reflects this alignment with European legal standards. Proton positions Lumo as a trustworthy AI assistant that matches its core privacy-driven mission by keeping the infrastructure in jurisdictions that prioritize user rights.

Stay secure and fully compliant in Europe. Proton VPN’s latest upgrade brings enhanced privacy across all platforms.  

Lumo’s market impact and expectations

Although Lumo may not match larger chatbots in scale or creative capabilities, its privacy-first design gives it a unique position in the market. As concerns about data misuse grow, tools like Lumo highlight that artificial intelligence can still be powerful without exploiting personal information.

This could pressure larger companies to adopt stricter privacy practices in response. Lumo offers users a secure and transparent option, signaling that privacy and advanced AI can coexist meaningfully.

With Lumo shaking up the market and Proton securing every chat with end-to-end encryption, discover how innovation and privacy are shaping the AI landscape.

What are your thoughts on balancing market impact and privacy in AI? Drop your insights in the comments.

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This slideshow was made with AI assistance and human editing.