What a privacy-first chatbot alternative means in practice
A privacy-first chatbot alternative is an AI assistant that matches mainstream tools on features such as text, image and web capabilities while giving users strict control over how their conversations are stored, encrypted and used for training, so sensitive data stays private by design rather than as an optional extra. Proton’s Lumo 2.0 fits that description: it aims to deliver ChatGPT-style help with a data privacy AI approach that refuses to trade your prompts for product improvements.
If you care most about raw capability, ChatGPT still wins with its more mature ecosystem, live voice mode and professional coding assistants. If you care most about privacy and governance, Lumo 2.0 is the more convincing default. The choice is less about which chatbot is “better” in the abstract and more about whether you value extra features or strict data protection. For most everyday users, the gap in answers is now small enough that privacy and policy should drive the decision.
Lumo 2.0 features: deep thinking, multimodal AI and locked-down data
Lumo 2.0 is Proton’s second-generation, privacy-first chatbot, built to be a real ChatGPT alternative while keeping your information out of training pipelines. It introduces two modes: a fast mode for quick, generic answers and a reasoning mode for slower, multi-step thinking, which adds the deep-thinking capabilities it previously lacked. On an independent benchmark index, Proton reports a 127% improvement in functions such as speed, reasoning and knowledge compared with Lumo 1.4, a concrete sign that the upgrade is more than cosmetic.
Multimodal support is now built in. Lumo 2.0 can process text and images in the same conversation, analyze pictures and generate new ones from prompts, with the same encryption rules applied to images as to text. That closes a key feature gap to mainstream models. Web search has been upgraded too, pulling live results with citations to stay current on news, events, finance and weather while aiming for fewer hallucinations. For users who want a privacy chatbot alternative without sacrificing modern AI features, these additions make Lumo far more compelling.
Privacy and data practices: why Lumo is different from ChatGPT
Lumo 2.0’s main selling point is its data privacy AI design. Proton says your conversations and inputs are not used to train the AI models powering Lumo, and it offers a Ghost mode so chats disappear after the conversation ends. In contrast, ChatGPT will use your chats to train its AI by default, though you can opt out in settings. One quotable difference is clear: Proton explicitly guarantees that “your chats aren’t used to train the AI models Lumo is built on,” while ChatGPT relies on user-controlled training preferences instead.
Proton also uses zero-access encryption, storing messages so that only you can decrypt them, which means even Proton cannot read your data. Lumo runs entirely on Proton’s own infrastructure and uses open source models, which supports more transparency and reduces third-party exposure. However, Lumo shares some structural limits with other large language models: it cannot offer full end-to-end encryption today. And on the other side, ChatGPT is currently keeping a significant portion of user chats, even deleted ones, due to ongoing legal proceedings. Both tools therefore have caveats, but Lumo’s policies show a stronger preference for minimising stored and reviewable data.
Everyday use: answer quality, speed and where ChatGPT still leads
In hands-on testing, Lumo 2.0 now produces answers that feel close to major chatbots for casual, everyday use. When generating images of a spaceship, forest cabin and cartoon cityscape, Lumo’s creations held their own, even beating ChatGPT’s attempt in at least one case, though ChatGPT’s images were often more impactful overall. For text responses, ChatGPT tended to be more thorough and detailed, while reviewers liked the way Lumo structured and presented information. That means Lumo is no longer obviously “behind” for general questions, but power users may notice differences in depth.
ChatGPT still has the edge in advanced features and ecosystem. It offers live voice mode and professional coding assistants that are not yet mirrored in Lumo. It is also a more mature product with a wider range of integrations and long-standing workflows. On the flip side, Lumo’s performance has improved significantly, with faster response times and better reasoning, enough that many users who once rejected it as underpowered should revisit it. If you are already comfortable with ChatGPT and rely on its specialised tools, it remains the more capable option; if you mainly need a capable chatbot that answers well without harvesting your prompts, Lumo now feels “good enough” in many cases.
Plans, enterprise controls and how to decide
Lumo’s pricing and tiers are designed to scale from casual users to organisations with strict governance. A Plus subscription at USD 9.99 (approx. RM46) per month offers unlimited daily chats and history, web search, large file analysis, access to advanced AI models and priority support. Another source describes a Pro tier at USD 12.99 (approx. RM60) per month with full chat history, higher usage limits and more advanced models, although this sits outside Proton’s other bundles. For businesses, Lumo Professional starts at USD 11.99 (approx. RM55) per month and adds secure collaborative tools, cloud storage, email aliases and extra Proton security features.
Enterprise-focused features further differentiate Lumo from ChatGPT. Business users can set how much contextual memory is kept about their preferences, helping with ongoing projects without locking them into unlimited data retention. Dedicated Projects workspaces let teams store conversations, files and instructions in a secure environment, and custom personas let organisations define Lumo as a trainer, teacher or assistant tuned to their needs. Privacy-first chatbots are gaining traction as organisations look for a ChatGPT alternative that aligns with internal data rules, and Lumo 2.0 is one of the first to combine strong privacy guarantees with image generation, reasoning modes and enterprise controls.
| Spec / Feature | Proton Lumo 2.0 | ChatGPT (current consumer offering) |
|---|---|---|
| Core positioning | Privacy-first AI chatbot built as a ChatGPT alternative with strict data-use limits | Mainstream AI assistant with wider ecosystem and integrations, privacy controls available via settings |
| Use of chat data for training | User chats are not used to train Lumo’s AI models by design; no human review of chats | Chats are used for model training by default, though users can opt out; some data retained for legal reasons |
| Image generation and analysis | Generates and analyzes images; supports text + image in one conversation with encrypted handling | Generates images and can analyze them; often more impactful image outputs in testing |
| Reasoning modes | Fast mode for quick replies and reasoning mode for multi-step deep thinking | Single interface with configurable modes; still considered more thorough in many responses |
| Web search | Improved web search with live results and citations to reduce hallucinations | Web-enabled modes available; quality can depend on configuration and plan (not detailed in sources) |
| Enterprise controls | Context memory controls, secure Projects workspaces, custom personas, Professional tier with collaboration tools and extra security | Enterprise offerings not detailed in provided sources; known for strong coding tools and voice features instead |
| Notable strengths from tests | Clear answer presentation, strong privacy posture, competitive image generation, major performance gains over earlier versions | More mature product, live voice mode, professional coding assistants, often more thorough responses and impactful images |
| Shared limitations / caveats | Cannot provide full end-to-end encryption, behaviour depends on whether chats are saved or erased | Retains a portion of user chats due to legal processes; privacy outcome depends heavily on settings and retention policies |
Buy if / Skip if
- Buy the Proton Lumo 2.0 if you want a privacy chatbot alternative where your chats are not used for training and are protected with zero-access encryption by default.
- Skip the Proton Lumo 2.0 if you rely heavily on features like live voice conversations or advanced coding assistants that are better served by ChatGPT today.
- Buy the Proton Lumo 2.0 if your organisation needs enterprise controls such as configurable memory, secure project workspaces and stricter data governance for AI workflows.
- Skip the Proton Lumo 2.0 if you are already invested in ChatGPT’s broader ecosystem and value its more mature, often more thorough responses over stricter privacy.
- Buy the ChatGPT if you prioritise answer depth, a richer feature set and more impactful image output over data-minimisation guarantees.
- Skip the ChatGPT if you are uncomfortable with default chat training, ongoing data retention and the possibility of human review of prompts compared with Lumo’s no-training stance.
