Proton Lumo 1.1 Amps Up the Performance, Reliability, and Accuracy

Proton has issued a major upgrade for its Lumo privacy-first AI assistant that provides significant performance, reliability, and accuracy improvements.

“Today we’re releasing a powerful update to Lumo that gives you a more capable privacy-first AI assistant offering faster, more thorough answers with improved awareness of recent events,” Proton’s Eamonn Maguire writes. “Guided by feedback from our community, we’ve been busy upgrading our models and adding GPUs, which we’ll continue to do thanks to the support of our Lumo Plus subscribers. Lumo 1.1 performs significantly better across the board than the first version of Lumo, so you can now use it more effectively for a variety of use cases.

Proton released Lumo one month ago with the promise of a free, confidential AI chatbot built around privacy, security, and transparency. All we knew at launch was that Lumo’s unnamed AI models were hosted on Proton’s European data centers as part of a “Eurostack” strategy designed to protect user privacy from the U.S., China, and other prying governments. Today, we know a bit more. Proton Lumo is powered by open-source large language models (LLMs), including Mistral Small 3, Nemo, OLMO 2 32B, and OpenHands 32B. And as with other Proton products, its source code is open source.

Lumo 1.1 is a big improvement over the original release, with a 170 percent improvement in context understanding for more accurate answers, a 40 percent improvement in coding requests and code creation, and an over 200 percent improvement in planning tasks, choosing the right tools such as web search, and working through complex multi-step problems, Proton says. As a result, this AI chatbot is now better at answering complex questions, planning projects that require multiple steps, researching current events, and generating software code.

As before, Lumo does what it does while protecting your privacy: It doesn’t keep a record of your chats, and your conversation history is secured with zero-access encryption. “Nobody else can see it and your data is never used to train the models,” Proton says. And with this release, the source code for the Lumo mobile apps has been open sourced too.

“This is especially important in AI because it confirms that the applications and models are not being used nefariously to manipulate responses to fit a political narrative or secretly leak data,” Maguire says. “In line with Lumo being the most transparent and private AI, we have also published the Lumo security model so you can see how Lumo’s zero access encryption works and why nobody, not even Proton can access your conversation history.”

Proton Lumo is free for anyone to use, but you can also subscribe to Lumo Plus for $12.99 per month (or $119.98 per year) and get unlimited chats, web search access, full chat history with search, unlimited favorites, the ability to upload and query large files, access to more advanced AI models, and priority support.

You can learn more about Proton Lumo on the Proton website.