Eustella promises European AI sovereignty — your data in the EU, the models from China

When a Vienna startup calls itself “Europe’s sovereign AI agent,” the phrase is doing a lot of work. Sovereignty sounds like independence—frontier models trained on European data, running on European compute, shaped by European values. What Eustella actually delivers is narrower and more honest: a full-stack AI assistant whose intelligence is borrowed from Chinese open-source models, run exclusively on European servers, under European law. The distinction matters, and the company knows it.

Built by newsrooms.ai—AI Newsrooms Technology GmbH, a Vienna-based AI integration firm led by CEO Matteo Rosoli—the product is a mobile-first assistant available on web, iOS and Android, currently in open beta. At its core is Qwen 3.5, the open-weight model developed by Alibaba Cloud, alongside DeepSeek and Moonshot, all deployed on EU-hosted infrastructure. The company is explicit about the trade-off: it takes the best available open-weight models—wherever they originate—runs them under European control, and argues that sovereignty means deciding the conditions, not building the engine yourself.

What that control delivers is real. User data stays within EU data centres, subject to GDPR, never transferred to US or Chinese clouds, never shared with third parties, never used to train models. For European businesses and individuals handling sensitive data—a category that has grown considerably as questions over foreign-jurisdiction data access have intensified—that is a meaningful assurance, not just a marketing line.

The assistant wraps the model infrastructure in a feature set built for everyday use: a customisable personality (the company calls it the “SOUL” setting), specialised agents for morning news digests, deep research, trip planning and document analysis, an Agent Builder for custom workflows, audio transcription and cited-source answers. Pricing runs from a free tier through three paid plans—Comet at €5.99/month, Star at €17.99/month and Cosmos at €89.99/month, VAT included. The company says it is targeting 100 million European users.

The marketing claims bear scrutiny. Eustella cites a #2 ranking among five leading AI assistants—ahead of ChatGPT, Gemini and Perplexity, behind Claude—but this is a self-reported beta-user survey, not an independent benchmark. The base model choice also raises a question the company’s own blog addresses directly: whether routing European data through Chinese open-weight inference, even on EU servers, constitutes the kind of sovereignty users expect. Eustella’s answer—that European control of the infrastructure is what matters—is coherent. Whether the market accepts it on those terms is the test the open beta will run.

The gap between “sovereign” and “European” is the whole argument here. Eustella has defined the word carefully enough that it can deliver on it. Whether European users and businesses will find that definition sufficient is the real launch question.

Tags: artificial intelligence, DeepSeek, AI assistants, Alibaba Cloud, data sovereignty, Eustella