The verdict in three sentences
A properly integrated B2B AI support chatbot costs 15,000 to 45,000 EUR in 2026, the range driven mainly by the quality of the RAG knowledge base and the number of connected systems. Expect 6 to 12 weeks of delivery and 400-1,000 EUR/month of maintenance. Well scoped, it absorbs 60% of requests through automatic resolution and cuts ticket volume by 30-45%.
What the integration budget covers
The cost is not just the "bot". You must ingest documentation, connect support tooling and secure the answers. Here is the typical 2026 breakdown for a London SME.
| Item | Range (EUR) | Timeline | Note |
|---|---|---|---|
| Scoping and flows | 2,000 - 5,000 | 1-2 wks | Use cases, tone, escalation |
| Knowledge base / RAG | 5,000 - 15,000 | 2-4 wks | Ingestion, vectorisation, cleanup |
| Tool integration (Zendesk, CRM) | 4,000 - 12,000 | 2-3 wks | API, tickets, human handoff |
| Web interface + widget | 3,000 - 8,000 | 1-2 wks | Chat, multilingual, branding |
| Testing, guardrails, go-live | 1,000 - 5,000 | 1 wk | Anti-hallucination, logs |
A "Starter" single-channel integration with 200 documents runs around 18,000 EUR, while a multi-product deployment wired to the CRM exceeds 40,000 EUR.
The recurring cost : AI API and maintenance
The language model is billed by usage. In 2026 the order of magnitude sits between 0.002 and 0.03 EUR per 1,000 tokens, depending on whether you use an economy or premium model.
| Monthly volume | Estimated tokens | API cost/month (est.) | Recommended maintenance |
|---|---|---|---|
| 1,000 conversations | ~4M tokens | 20 - 120 EUR | 400 EUR |
| 5,000 conversations | ~20M tokens | 100 - 600 EUR | 600 EUR |
| 15,000 conversations | ~60M tokens | 300 - 1,800 EUR | 1,000 EUR |
| 30,000 conversations | ~120M tokens | 600 - 3,600 EUR | 1,300 EUR |
Maintenance covers knowledge-base refresh, new content, resolution-rate tracking and guardrail tuning. Without it, quality degrades within 3 to 4 months.
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Mini case study
Thomas, head of customer support at a B2B software vendor in London, handles 4,200 tickets/month with 6 agents. Average fully-loaded cost of a human-handled ticket: 9 EUR. He invests 26,000 EUR in integration and 700 EUR/month of maintenance + 350 EUR/month of API.
With a 60% automatic resolution rate, the bot absorbs ~2,520 tickets/month. Even counting only 35% effective net deflection (1,470 tickets), monthly savings are 1,470 x 9 = 13,230 EUR versus ~1,050 EUR of recurring cost. The project pays back in under 3 months, with agents redeployed to strategic accounts.
FAQ
What is the credible minimum budget in 2026? For an honest scope (RAG + widget + human escalation), expect at least 15,000 EUR. Below that you get a scripted bot with no real understanding that frustrates B2B customers.
How long until go-live? Between 6 and 12 weeks. The limiting factor is not the code but the quality and cleanup of the documentation to ingest.
Will the chatbot hallucinate? With a RAG architecture and guardrails (citations, confidence thresholds, escalation), the error rate drops below 2-3%. A human always stays in the loop for sensitive cases.
What ticket reduction should I target? A realistic goal is -30 to -45% volume over 6 months, with 60% of conversations resolved without an agent. Beyond that, you hit complex cases that need a human.
What does the AI API really cost? From 20 EUR/month for 1,000 conversations to 1,800 EUR/month beyond 15,000, depending on the model. We optimise via caching and hybrid models.
Let's scope your project. Share your ticket volume, support tools and product scope: we quote an integration between 15,000 and 45,000 EUR with projected ROI. 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.
