The verdict in three sentences
A useful internal AI agent relies on RAG (retrieval-augmented generation): it answers from your documents, not general knowledge. In 2026, a custom POC costs EUR 12,000-28,000, with a vector store and ingestion of EUR 4,000-9,000, and EU or on-premise hosting mandatory for sensitive data. The real risk isn't cost but data leakage to an unmanaged public SaaS.
Public SaaS vs sovereign deployment
Pointing public ChatGPT at contracts or HR files sends your data beyond your control. A sovereign deployment keeps everything within a managed perimeter. Here's the 2026 trade-off.
| Criterion | Public AI SaaS | Sovereign (EU/on-prem) |
|---|---|---|
| Setup cost | low (EUR 0-2,000) | EUR 12,000-28,000 |
| Data hosting | often outside EU | EU or on-premise |
| GDPR compliance | risky on sensitive data | controlled |
| DPIA | hard to guarantee | recommended, documented |
| Monthly inference cost | per seat | EUR 50-500/month pooled |
| Access control | limited | fine-grained, by role |
For personal or strategic data, GDPR Article 28 requires a strict contractual framework with the processor, and a DPIA is recommended whenever processing presents a high risk.
3-year TCO of an internal AI agent
The recurring inference cost is often underestimated. Here is a 2026 estimate for a RAG agent serving 50 internal users.
| Line item | Year 1 | Annual recurring |
|---|---|---|
| POC + vector store | EUR 16,000-37,000 | — |
| Ingestion & doc connectors | EUR 4,000-9,000 | EUR 1,500-3,000 |
| EU/on-prem hosting | EUR 3,000-6,000 | EUR 3,000-6,000 |
| Inference (model) | EUR 600-6,000 | EUR 600-6,000 |
| Maintenance & enhancements | — | 12-18% of build |
| DPIA & GDPR documentation | EUR 2,000-5,000 | annual review |
An AI/LLM engineer day rate is EUR 700-900 in 2026 (ballpark). Over 3 years, a full sovereign deployment typically sits between EUR 35,000 and 70,000, licences and inference included.
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Mini case study
Nadia, general counsel of a 250-person group, wants an assistant that can find and summarize clauses across 4,000 contracts without those documents leaving the EU. She funds a EUR 22,000 RAG POC hosted on an EU cloud, with a DPIA. Her 8 lawyers each save about 5 hours/week of document search, i.e. 40 combined hours/week. Valued at EUR 60/h, that's ~EUR 115,000/year of reallocated time, for a year-1 TCO around EUR 30,000. Payback in under 4 months, data kept under control.
FAQ
Does RAG really avoid hallucinations? It sharply reduces them by grounding answers in your documents, with source citations. Zero hallucination doesn't exist, but traceability changes everything.
Do I have to host the model myself? Not necessarily. GDPR-compliant EU hosting suffices in most cases; on-premise is justified for highly sensitive or regulated data.
How much is inference per month? Between EUR 50 and 500/month depending on query volume and model, pooled across users rather than billed per seat.
Is a DPIA mandatory? It's recommended, and mandatory whenever processing presents a high risk to individuals (sensitive data, profiling). We document it from the POC.
How long for a first POC? 4 to 8 weeks depending on document volume and source quality. A narrow scope lets you validate fast.
Let's scope your project. Describe your use cases, document volume and confidentiality constraints (EU, on-premise), and we'll price a compliant RAG POC. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
