Sovereign alternative to ChatGPT:
which AI for your business?
ChatGPT has become a reflex for millions of professionals. But when it comes to integrating AI at the heart of your business, with confidential data and regulatory requirements, the question is different.
This guide compares LetzAgents and ChatGPT factually, to help you choose the right solution for your professional context in Luxembourg and Europe. Summarizing a document, drafting an email, analyzing a spreadsheet: OpenAI's ChatGPT is impressive. But when it comes to confidential data, regulatory requirements and reliable answers grounded in your documents, the approach must be different.
Presentation of both solutions
ChatGPT
OpenAIChatGPT is a general-purpose conversational AI developed by OpenAI, an American company. Available in free and paid versions (ChatGPT Plus, Team, Enterprise), ChatGPT is designed for general public and professional use, with very broad general knowledge but no specific knowledge of your business. Since 2025, free accounts and the Go plan display ads in responses.
LetzAgents
LuxembourgLetzAgents is a private and sovereign AI solution, developed in Luxembourg and hosted exclusively in Europe. Unlike ChatGPT, LetzAgents creates a dedicated instance for your company, trained on your own internal documents (contracts, procedures, knowledge bases). Your data never leaves your infrastructure and is never used to train other models.
Hosting and data sovereignty
ChatGPT hosts your data on OpenAI's servers, primarily in the United States. Even with the Enterprise version, your queries pass through OpenAI's infrastructure. Since the invalidation of Privacy Shield and uncertainties around the Data Privacy Framework, transferring personal or confidential data to the US poses a real legal risk for European companies.
LetzAgents hosts your entire instance (AI models, documents, conversations) on European servers certified ISO 27001. No data passes through third-party servers. Your instance is isolated and only accessible to your organization.
For a Luxembourg company subject to professional secrecy (law firm, fiduciary, financial sector), this distinction is not a technical detail, it's a regulatory obligation.
GDPR compliance
OpenAI has been the target of several investigations by data protection authorities in Europe (Italy, France, Germany). The question of the legal basis for ChatGPT's processing of personal data remains debated. The Enterprise version offers contractual guarantees (DPA), but data is still processed by an American company subject to the Cloud Act.
Data processing remains entirely under European jurisdiction. No transatlantic transfer, no Cloud Act exposure. The data controller retains full control over their data. The architecture was designed from the start to meet GDPR requirements and the future EU AI Act.
LetzAgents offers native and complete GDPR compliance, without compromise related to data transfer outside the EU.
Customization and knowledge base
ChatGPT responds from its general knowledge. Even with custom GPTs or file upload functionality, ChatGPT only has a limited context (context window) and cannot permanently ingest complete company documentation. Responses remain generic on your business topics.
LetzAgents uses RAG (Retrieval-Augmented Generation) technology to connect AI to your complete document base: PDF, Word, Excel, web pages, audio files. The AI queries your documents in real time and cites its sources (e.g.: "According to HR procedure page 12"). Responses are grounded in your business reality.
LetzAgents transforms your internal documents into an intelligent knowledge base, with source citation to back it up.
Response reliability
ChatGPT is prone to "hallucinations": it can generate plausible but factually incorrect answers, especially on specialized or recent topics. For professional use where accuracy is critical (legal, financial, medical), this is a significant risk.
Thanks to RAG, LetzAgents grounds its responses in your source documents. Each response can be verified against the original document. This doesn't completely eliminate errors, but drastically reduces hallucinations and allows complete auditing of each response.
LetzAgents' RAG drastically reduces hallucinations and allows you to verify each response with the source document.
Who is each solution for?
ChatGPT is a good choice if:
- You use it for generic tasks (brainstorming, writing, summarizing public content)
- You don't handle sensitive or confidential data
- You don't have strict regulatory constraints
- You're looking for an individual tool, not an enterprise solution
LetzAgents is designed for you if:
- You handle confidential data (contracts, client files, HR documents)
- You are subject to GDPR, professional secrecy or sector regulations
- You need answers based on your internal documents
- You want an AI that knows your company, your processes, your vocabulary
- You are in Luxembourg or Europe and data sovereignty matters
3 reasons to choose LetzAgents over ChatGPT
ChatGPT is built for consumers. Your business data deserves better.
No consumer AI for your sensitive data
ChatGPT processes your data on US servers and may use it to train its models. LetzAgents hosts everything in Europe on a dedicated, isolated instance, ISO 27001 certified. Your data never leaves your environment.
- Dedicated European hosting (ISO 27001)
- No data used for training
- Isolated instance, no shared cloud
No more ephemeral conversations
ChatGPT starts from scratch every session. LetzAgents builds a permanent knowledge base connected to your internal documents via RAG, with sourced and contextualised answers.
A business tool, not a consumer toy
ChatGPT is a generalist chatbot. LetzAgents deploys AI agents across all your channels — chatbot, phone, email — with local support in Luxembourg.
LetzAgents vs ChatGPT:
| Criteria | ChatGPT | LetzAgents |
|---|---|---|
| Hosting | United States (OpenAI) | Europe (ISO 27001) |
| Ads in responses | Yes (Free & Go) | Never |
| Data used for training | No (Enterprise) / Yes (Free) | Never |
| Dedicated isolated instance | No (shared infra) | Yes (isolated instance) |
| Native GDPR compliance | Partial (DPA) | Complete (EU hosting) |
| Cloud Act exposure | Yes | No |
| Enterprise knowledge base | Limited (file upload) | Complete (RAG on all docs) |
| Source citation | No | Yes (document + page) |
| Business customization | Superficial (GPTs) | Deep (RAG + fine-tuning) |
| Multilingual (FR/EN/DE/LB) | Yes | Yes |
| Local Luxembourg support | No | Yes |
| AI phone agent | No | Yes |
| Embeddable chatbot | No | Yes |
Book a meeting
Let's discuss your needs and see how LetzAgents can help you.
Frequently asked questions
Everything you need to know to choose between ChatGPT and LetzAgents.
Isn't ChatGPT Enterprise enough to protect my data?
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ChatGPT Enterprise offers a DPA (Data Processing Agreement) and guarantees that your data is not used for training. However, your data still passes through OpenAI's infrastructure in the United States. For companies subject to professional secrecy in Luxembourg or handling health, financial or legal data, this may pose a compliance issue.
Can I migrate from ChatGPT to LetzAgents easily?
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Yes. LetzAgents requires no complex technical migration. You provide your internal documents, and the LetzAgents team configures your private instance. There is no data to "export" from ChatGPT, since ChatGPT does not store your knowledge base in a structured way.
Does LetzAgents use the same models as ChatGPT?
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LetzAgents uses high-performance AI models hosted in Europe. The model choice is adapted to your use case. The key advantage is not the model itself, but the architecture: a private instance connected to your documents, hosted in your jurisdiction.
What is the cost compared between ChatGPT Enterprise and LetzAgents?
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ChatGPT Enterprise is charged per user (approximately $60/month/user) without business customization. LetzAgents offers plans adapted to your company size, including document ingestion, local support and sovereign hosting. Check our pricing for a detailed comparison.
Are LetzAgents' responses as good as ChatGPT's?
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On general questions, ChatGPT and LetzAgents offer comparable quality. On questions specific to your company, LetzAgents is clearly superior because it relies on your actual documents. And above all, it cites its sources,something ChatGPT doesn't do for your internal content.
Hesitating between the two solutions? Book a meeting with our team for a personalized demo with your own documents.
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