Lumo Updates & Release Notes

Last year we launched Lumo, a zero-access encrypted AI assistant that never logs your conversations or trains on your data. Since then, more than 10 million people have started using it, and we’ve shipped major updates, including custom conversation styles, dedicated encrypted project spaces, more powerful models, and more.

Today we’re announcing Lumo 2.0, the most significant change since launch. We’ve rebuilt Lumo on a new architecture with capabilities that bring it to the frontier of what AI can do. As always, it runs on Proton’s fully European infrastructure, protected by Swiss privacy laws and zero-access encryption.

Advanced reasoning models

Lumo 2.0 is our biggest leap in capability yet. On the Artificial Analysis Intelligence Index (new window), an independent benchmark combining 10 evaluations across agents, coding, scientific reasoning, and general knowledge, Lumo 2.0 Lite scores 127% higher than Lumo 1.4, and Lumo 2.0 Max scores 240% higher.

Lumo 2.0 also introduces fast and reasoning modes to make everyday interactions feel faster while giving more demanding tasks additional depth. Fast prioritizes speed and Thinking is optimized for more complex, multi-step reasoning — a capability that didn’t exist in Lumo 1.4.

Lumo 2.0 responds to everyday queries up to 76% faster than Lumo 1.4. More complex tasks requiring deeper thinking now benefit from a visible thinking state, letting you see how Lumo is working through the problem in real time.

Image recognition and generation

Lumo 2.0 is now multimodal, able to process both text and images. Upload an image to analyze, create visuals from a prompt or a rough sketch, or edit existing images, all in the same conversation.

Lumo’s zero-access encryption applies to image processing too. Images you upload and the images Lumo generates are stored so that no one, not even Proton, can access them.

Image generation

Describe what you want and Lumo creates it. Type a prompt, refine it in the same conversation, and iterate until it looks exactly right. From a logo concept to a travel poster, start with words and end with an image.

Image editing

Upload an image and tell Lumo what to change. Swap backgrounds, adjust colors, remove unwanted objects, or completely re-imagine a scene.

Image analysis

Upload a chart, a document, a screenshot, or a photo and ask Lumo anything about it. Lumo identifies what’s in the image, reads the data, and responds with detail.

Sketch to image

Upload a rough sketch and describe what you want it to become. Tell Lumo the style, the mood, the details, and watch it take shape.

Powerful new web search capabilities

Compared to Lumo 1.4, Lumo 2.0 has far stronger web search. When a question calls for current information, Lumo pulls live results from across the web and cites its sources, so you can verify answers and dig deeper. It stays current on recent news and events, draws on live financial data, and can even pull in weather forecasts. The result is more accurate, more complete answers with fewer hallucinations.

Deeper context with memories

Lumo 2.0 combines user-controlled memory and Projects to move beyond one-off questions toward collaboration that builds over time.

Memory lets Lumo learn your preferences, working style, and ongoing context, so every conversation starts smarter than the last. You decide what it retains, what it forgets, and what it never learns in the first place.

The context window is now twice as large, so Lumo holds longer conversations coherently and reasons across longer documents and bigger datasets. For work that spans multiple sessions, Projects go further: Each is a dedicated encrypted workspace that keeps your chats, files, and instructions together.

Every piece of context is protected by zero-access encryption, the same architecture that secures over 100 million Proton Mail and Proton Drive users.

Custom Lumos

Lumo 2.0 also introduces Custom Lumos, purpose-built assistants tailored to specific tasks. Build a writing assistant that always drafts in your tone, or a research assistant that structures answers the way you need them. You define the instructions once, and the Custom Lumo follows them every time, no re-explaining required.

Private AI for businesses

Most AI tools create a new category of risk for businesses. Employee queries become training data. Confidential documents can be compromised. And your data sits on infrastructure subject to US law — with recent events already showing how fast access can vanish for international users.

Lumo for Business is built for organizations that can’t afford those risks. Every conversation is zero-access encrypted, never logged, and never used to train future models. Administrative tools let you manage your team’s access, and your data stays on independent European infrastructure, meaning access to Lumo cannot be subject to US Executive Orders and user data is not subject to American data collection requests.

Intelligence without surveillance

With Lumo 2.0, you no longer have to choose between advanced AI and privacy.

People now share more with AI systems than they ever shared with any other technology, and the dominant providers are normalizing a future where your personal data is the price of participation. Conversations are getting mined for training. Behavior is being used as a signal for profiling. Ads are arriving inside the most popular assistants. And control over all of it is now concentrated in the hands of a few US tech companies (many with government and defense contracts) with increasing commercial pressure to monetize your attention.

We believe AI should empower people, not extract from them. As it becomes infrastructure for work, creativity, and communication, privacy can no longer be optional. Lumo brings Proton’s privacy standards to AI: zero-access encryption, no logs, no data sharing, and no training on your conversations. And because Lumo is fully open source, anyone can inspect the code, verify the encryption, and confirm it works exactly as we say.

Lumo 2.0 is live now

• Free: Sign up (new window) for private AI with core capabilities.
• Lumo Plus: Unlimited chats, Projects, advanced image generation, and priority access to the fastest models.
• Lumo Professional: Premium features for teams, enabling secure collaboration without data leak risks.

We are shaping a future where AI works for you. Share your thoughts on X (new window) and Reddit (new window).

Your private AI assistant should be a natural extension of your workflows — remembering the nuances of your work and helping you move more quickly from idea to execution. Without collecting any of your data, it should work with you and not just for you.

Lumo 1.3 delivers exactly that with Projects: a dedicated, encrypted space where you can bundle chats, files, and requirements for any task and have them remain in sync across every device and session. This gives Lumo the context it needs to chip in on larger projects or recurring subjects, whether you’re working on a big report, ongoing university coursework, or your 2026 planning. Staying private and productive has never been easier.

Create a Project

Introducing Projects, the better way to focus, organize, and create

Work smarter, not harder

Projects are encrypted AI workspaces where you can keep all files and chats for a project in one place, along with specific instructions for the project. Lumo remembers all conversations and files associated with the project so you don’t have to repeat instructions or re-explain things. Lumo can immediately pick up where you left off because it remembers all the context.

You can create a Project for just about anything and set tailored custom instructions. Maybe you manage multiple clients or cases, and want Lumo to know something different about each of them. Lumo will remember the background, preferred tone, and focus areas across every conversation in that Project.

You spend less time re‑explaining and defining, and more time getting meaningful, on‑point results.

Keep your data organized and private

Each Project is its own encrypted environment, giving you a clear home for specific areas or workstreams. You can upload files and resources that are important to that project, helping Lumo provide more relevant and accurate responses when analyzing documents or summing up insights.

Projects are integrated with Proton Drive, making it easy to link relevant folder and files to each space while giving you peace of mind that every file is only accessible to you. Lumo never uses your data to train AI models, and your chat histories are zero-access encrypted.

Get the full Lumo experience

Projects are now available to all Lumo users, with a limit of one Project for users logged in on a free account. If you’re handling multiple workstreams, upgrading to Lumo Plus unlocks unlimited Projects, faster response times, access to our most advanced AI models, unlimited chats, and more.

For businesses, Lumo Professional empowers you and your team with all premium features of our privacy‑first AI assistant, speeding up delivery, facilitating effective business strategy and decision-making, streamlining processes, and simplifying compliance across every workstream.

The next chapter in privacy‑first productivity

Projects mark the next step in Lumo’s evolution as a smart AI assistant that complements day-to-day use without sacrificing privacy. Projects keep your work focused, accessible, and truly yours.

Lumo 1.3 is available starting today for all users, and we’re excited for you to try it. Let us know your experiences and feedback, and stay tuned for future innovations, on X (new window) and Reddit (new window).

AI assistants give businesses an edge, helping teams work smarter and save time. But Big Tech AI services come with risky baggage. They log your organization’s data, can share it with third parties, and can leak it to governments and hackers.

Not Lumo.

Lumo is the only AI that gives you all the advantages and without the privacy risks. Millions of individuals are already using our AI assistant to find answers, draft documents, and get more done. Now we’re bringing that same power to organizations with Lumo for Business.

Lumo for Business is a new plan that enables your whole workforce to be secure, compliant, and productive with powerful AI. Unlike other AI services that require expensive enterprise plans, Lumo is affordable for teams of any size with no minimums.

Boost productivity and stay in control

With Lumo for Business, you get the benefits of AI without giving up control over your business data. It’s perfect for companies that have a strict need for confidentiality, like financial advisers, law firms or tech companies with a lot of Intellectual Property.

Here’s what you can do with Lumo:

Protect your business data

Lumo never keeps a record of your conversations, and your team members’ chat histories are stored with zero-access encryption. That means that a given user’s chats can only be decrypted on that same user’s devices using that person’s password. Since we don’t keep a record of your chats, we also can’t share them with any third parties or leak them.

Everything you say to Lumo, whether it’s your intellectual property or information about your clients, is entirely under your control and only accessible to you.

Get more done

You can use Lumo to analyze datasets, summarize meeting notes, draft documents, and plan brainstorms more efficiently. Lumo integrates with Proton Drive, so you can easily add PDFs or Docs to your conversations for more context and better responses.

Stay compliant, and protected by European privacy law

Because Lumo is hosted entirely in Europe, your data benefits from some of the world’s strongest privacy protections. Lumo is also GDPR compliant by design, so we are legally prevented from abusing your data. By contrast, US-based AI services retain logs for their own use and can be compelled to hand over chats to the government. If AI is not based in a privacy-friendly jurisdiction, it is not truly confidential. The primary owner of Lumo is the nonprofit Proton Foundation based in Geneva, Switzerland.

Trust your AI software

Big Tech AI doesn’t show you the code you’re bringing into your business. Once again, Lumo does things differently. Our codebase is open source, so anyone can trust and verify our apps are secure and do exactly what we claim. You can explore our iOS, Android, and web app code. We also only use open-source models, which gives you peace of mind that the training data, methods, and model weights have been vetted by the public.

Getting started is simple

Privacy and security tools should be easy enough for anyone to use. And that includes professional software. To get started, your team can simply download the apps for iPhone or Android. There’s nothing you need to integrate — no IT required.

With Lumo for Business, you get access to our most advanced models, the fastest responses, and unlimited responses. And you’ll be among the first to get new features as we release them.

More than 100 million people already trust Proton Mail, Proton VPN, Proton Pass, and Proton Drive to protect their most sensitive information. Lumo for Business extends that same protection to AI, so your business can embrace new technology without giving up control over your data.

Have questions about using Lumo in your organization? Connect with our team.

Lumo 1.2 is here, and it’s all about tailoring your experience to help you be more productive.

Feedback from our community shows you want a private AI assistant (new window) that’s more customizable to your needs — whether that’s switching to dark mode or asking Lumo to respond with a consistent tone or style.

Following our major knowledge and reasoning improvements with Lumo 1.1, the new Lumo 1.2 delivers on two highly requested features:

• Choose your favorite look for Lumo with dark mode
• Customize your experience by setting your preferred writing style for Lumo

Try Lumo 1.2 (new window)

As always, your chats in Lumo remain completely confidential. Any personalization options you enable retain Lumo’s zero-access encryption, meaning Lumo never keeps any logs and your chat histories are only accessible to you.

Dark mode is here

Dark mode has been one of our community’s most highly anticipated updates for Lumo. Throughout the Proton ecosystem, you can customize the look of all of your apps, and now you can customize Lumo, too, with a light or dark theme.

Customize Lumo’s writing style

Lumo already lets you integrate Proton Drive so that it’s easy to add or remove documents and PDFs from Lumo’s working memory. That’s a powerful way to give Lumo more context for your chats and get better results.

To personalize Lumo further, you can now specify your preferred writing style, tell Lumo your name, and share any other instructions you’d like Lumo to keep top of mind. Getting the answers you need in the way you want them helps you work faster and more seamlessly.

Finding the perfect voice for Lumo makes it easier to find the words you’re looking for, whether you’re writing a casual email or a formal research proposal. The traits you choose for Lumo and the information you want Lumo to remember about you can help you create the ideal AI assistant that always speaks your language.

Crucially, adding personalization doesn’t compromise your privacy: Your chats are still fully confidential and they aren’t used to train Lumo’s models. Even while you’re teaching Lumo how to speak more like you, your conversations are still private and secured with zero-access encryption (new window).

Get more from Lumo with Lumo Plus

These updates are free to all Lumo users, but you can unlock more space for chat knowledge, get faster responses, and unlimited usage with Lumo Plus. Upgrade to Lumo Plus to unlock its full power and invest in the future of privacy-first AI.

Get Lumo Plus

Because Lumo is expensive to operate, we are making Lumo Plus available as a standalone product or an add-on rather than raising prices and adding it by default to existing Unlimited, Family, and Duo plans. At Proton, we give you the freedom to only use AI if you want to.

Building AI that doesn’t exploit you

You don’t need to give your data to Big Tech in order to access powerful AI tools. Lumo was built to give you the power of AI without forcing you to submit yourself to mass surveillance.

With a business model that doesn’t rely on selling your data, Lumo is the privacy-focused alternative that’s changing what you can expect from AI and helping you make the most of it. As always, let us know your thoughts and feedback on X (new window) and Reddit (new window).