The verdict in three sentences
A B2B AI customer service chatbot in Berlin costs EUR 12,000 to 35,000 in 2026 for a RAG engine wired to your documentation, plus EUR 5,000 to 12,000 for CRM integration. The variable token cost stays low (EUR 0.002 to 0.03/request) and the run sits around EUR 200 to 800/month. Well calibrated, it deflects 30 to 50% of tier-1 tickets, with payback often under 12 months.
Custom build vs SaaS chatbot: the real trade-off
The question is not "AI or not" but "custom or subscription". A SaaS starts fast and cheaper but plateaus on personalisation and data control; a custom RAG build costs more upfront but pays off on high volumes and specific business cases.
| Criterion | Custom RAG build | SaaS chatbot |
|---|---|---|
| Upfront cost | EUR 12,000 - 35,000 | EUR 0 - 3,000 |
| Monthly cost | EUR 200 - 800 | EUR 300 - 2,000 |
| Data control | Full (EU hosting) | Variable |
| Business answer quality | High (RAG on your docs) | Medium to good |
| CRM/IS integration | Custom | Limited to connectors |
| Time to launch | 4 - 8 weeks | 1 - 2 weeks |
Below 500 tickets/month, a SaaS is often enough. Above that, and whenever business accuracy matters, the RAG build takes the lead.
Total cost over 3 years (TCO)
The entry price doesn't tell the whole story. Over 36 months, run and tokens end up weighing as much as the build. Here is a 2026 order of magnitude for a chatbot handling 2,000 requests/month.
| Item | Year 1 (EUR) | Years 2-3 /yr (EUR) |
|---|---|---|
| RAG build + CRM integration | 24,000 | 0 |
| Run (hosting, monitoring) | 4,800 | 4,800 |
| AI tokens (2,000 req/month) | 720 | 720 |
| Maintenance & improvements | 3,000 | 3,500 |
| Total | 32,520 | 9,020 |
Over 3 years, the TCO comes out around EUR 50,500, to compare with the cost of a part-time support agent dedicated to repetitive questions.
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Mini case study
Sophie, customer service lead at a B2B SaaS vendor in Berlin (12 support staff), deploys a RAG chatbot on her knowledge base. Budget: build EUR 22,000 + CRM integration EUR 8,000 + run EUR 450/month. Support handled 2,400 tickets/month, 55% of them repetitive tier-1. The bot deflects 40%, i.e. 528 fewer tickets/month. At EUR 6 human handling cost per ticket, the saving reaches EUR 3,168/month. Once the run is deducted (EUR 450/month), net gain is EUR 2,718/month: the EUR 30,000 investment pays back in about 11 months.
FAQ
How much does a token really cost in 2026? Depending on the model, EUR 0.002 to 0.03 per request handled. On 2,000 requests/month that is EUR 40 to 60: tokens are rarely the issue, the run is what weighs.
What is RAG and why does it change everything? RAG makes the AI answer from YOUR documents, not generic knowledge. That is what moves business relevance from "OK" to "reliable" and cuts hallucinations.
How many tickets can you really deflect? 30 to 50% of tier-1 tickets at steady state, after 4 to 8 weeks of training on real exchanges. Complex cases stay routed to humans.
Should the CRM be integrated from day one? For B2B use, yes: without client context (contract, history) the bot stays generic. CRM integration costs EUR 5,000 to 12,000 but often doubles perceived value.
Where is the data hosted? On a custom build, you choose EU hosting and the model. That is a key argument against SaaS whose data location is sometimes unclear.
Let's scope your project. Tell us your monthly ticket volume, the share of repetitive questions and your CRM: we price the RAG build, integration and run with a 3-year TCO. 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.
