The verdict in three sentences
A custom AI chatbot plugged into your knowledge base (RAG) deflects 40 to 60 % of level-1 requests at a cost of 0.05 to 0.30 EUR per conversation. The 2026 budget sits between 12,000 and 45,000 EUR (excl. tax), delivered in 5 to 12 weeks, with 12 %/year maintenance. The difference between a gadget and a profitable tool is the quality of the knowledge base and a smooth handover to a human.
What a chatbot costs by scope
Price depends on the number of knowledge sources, integrations (CRM, orders, billing) and the level of customization.
| Scope | Cost (EUR excl. tax) | Timeline | Auto-resolution | Integrations |
|---|---|---|---|---|
| Enriched FAQ (simple RAG) | 12,000 - 20,000 | 5-7 wks | 35 - 45 % | 1 source |
| Connected support | 20,000 - 32,000 | 7-10 wks | 45 - 55 % | CRM + orders |
| Advanced omnichannel support | 32,000 - 45,000 | 10-12 wks | 55 - 60 % | CRM + ERP + tickets |
| Multilingual option | +4,000 - 9,000 | +2 wks | - | per language |
| Escalation + agent handover | included | - | - | ticketing tool |
A realistic auto-resolution rate sits between 40 and 60 %. Beyond that, quality degrades: it is better to escalate cleanly than to force an answer.
Running cost and satisfaction
Once in production, the chatbot is billed per conversation. Here is the 2026 order of magnitude and the measured impact.
| Metric | Before | After chatbot | Effect |
|---|---|---|---|
| Cost per conversation | 4 - 6 EUR (human) | 0.05 - 0.30 EUR (AI) | -90 % on L1 |
| First response time | 4 - 24 h | < 5 s | near instant |
| Customer satisfaction (CSAT) | baseline | +15 points | 24/7 availability |
| Annual maintenance | - | 12 % of project | KB + model updates |
| Volume handled/agent | baseline | +30 - 50 % | refocus on L2/L3 |
The gain is not only financial: 24/7 availability and instant responses raise satisfaction by an average of 15 points, a concrete retention lever.
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Mini case study
Thomas is customer-service director at a 60-employee B2B e-commerce firm in Nantes. His center handles 5,000 conversations/month at an average human cost of 5 EUR. He invests 30,000 EUR (excl. tax) in a chatbot connected to the CRM and order tracking, delivered in 9 weeks.
With a 52 % auto-resolution rate, 2,600 conversations/month move to AI at 0.20 EUR each. The gross saving is 2,600 x (5 - 0.20) = 12,480 EUR/month. After removing 3,600 EUR/year of maintenance, the net annual gain exceeds 145,000 EUR, and the project pays back in under 3 months. CSAT rises 14 points over the quarter.
FAQ
What is the difference from a classic rule-based chatbot? An AI RAG chatbot understands natural language and draws answers from your actual documentation, whereas a rule-based bot follows rigid trees. The resolution rate typically rises from 15-20 % to 40-60 %.
How do you avoid false answers? By grounding the AI in your knowledge base (RAG), limiting its scope and escalating to an agent when uncertain. A test suite and weekly quality monitoring are included in maintenance.
What monthly cost once live? The cost per conversation (0.05-0.30 EUR) plus hosting and 12 %/year maintenance. For 5,000 conversations/month, expect an order of magnitude of 300 to 900 EUR/month all-in.
Can it handle multiple languages? Yes, each additional language adds roughly 4,000 to 9,000 EUR (excl. tax) and two weeks, mainly for translation and knowledge-base testing.
How long to go live? From 5 to 12 weeks depending on scope and number of integrations. An enriched FAQ ships in 5-7 weeks; omnichannel support connected to the ERP takes 10-12 weeks.
Let's scope your project. Tell us your monthly request volume, your channels and target integrations: we will scope a chatbot with a guaranteed resolution rate. 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.
