The verdict in three sentences
Generative AI only pays off in an SME on a precise, measurable, repetitive use case: customer support, sales copywriting or document extraction. A serious PoC costs 8,000 to 25,000 EUR and ships in 4 to 10 weeks, with a monthly API cost you must cap from the start. Real ROI comes from the -30 % time freed on low-value work, not the showcase effect.
Where generative AI really pays in 2026
Projects that fail start from a tool; those that succeed start from a costed process. Here are the mature use cases in London in 2026, with project cost and monthly API cost (2026 order of magnitude).
| Use case | Project cost (EUR) | Monthly API cost | Observed ROI |
|---|---|---|---|
| Assisted copywriting (proposals, product sheets) | 8,000 - 15,000 | 150 - 600 | -35 % writing time |
| Level-1 support (FAQ, emails) | 12,000 - 25,000 | 300 - 1,200 | -30 % manually handled tickets |
| Document extraction (quotes, contracts) | 12,000 - 30,000 | 200 - 900 | -60 % manual data entry |
| Meeting summaries / minutes | 6,000 - 14,000 | 100 - 400 | -50 % minutes-writing time |
| Internal search (document RAG) | 15,000 - 35,000 | 250 - 1,000 | -40 % search time |
API cost depends on token volume: an assistant handling 5,000 requests/month on a top-tier model costs more than a well-tuned economy model. The 2026 rule: pick the smallest model that holds quality, then cache recurring prompts.
Budget, timeline and data protection
| Line item | 2026 range | Note |
|---|---|---|
| Scoping + PoC | 8,000 - 25,000 EUR | 4 to 10 weeks |
| Production rollout | 5,000 - 15,000 EUR | guardrails, logs, tests |
| LLM API (monthly) | 150 - 1,200 EUR | by volume and model |
| EU hosting / compliance | 1,000 - 4,000 EUR | DPA, data residency |
| Annual maintenance | 15 - 20 % of project | prompt + model evolution |
On data protection: in 2026 prefer EU/UK data hosting, a signed DPA with the model provider and no training on your data. Sensitive data (HR, health) requires upstream anonymisation.
Mini case study
Claire runs a 40-person industrial SME in London. Her sales reps spend 6 h/week each writing quotes and technical sheets: 8 reps x 6 h = 48 h/week. A copywriting assistant wired to her catalogue costs 13,000 EUR in project and 400 EUR/month in API. Cutting writing time by 35 %, she recovers ~17 h/week, roughly 680 h/year. Valued at 35 EUR/h, that is ~23,800 EUR/year of redeployed time. The project pays back in under 9 months, API included.
FAQ
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How much does a first generative AI project cost for an SME?
A targeted PoC costs 8,000 to 25,000 EUR in 2026, with production rollout an extra 5,000 to 15,000 EUR. The ticket varies mainly with integration into your existing tools.
What is the real monthly LLM API cost?
Between 150 and 1,200 EUR/month for an SME, depending on request volume and model. Good tuning (small model + cache) often halves the bill with no perceived quality loss.
How fast do we see a result?
A PoC ships in 4 to 10 weeks. The -30 % ROI on repetitive tasks is measured within the first 2 to 3 months of real use, not in a demo.
Is my data protected?
With EU/UK hosting, a signed DPA and no training on your data, risk is controlled. Sensitive data must be anonymised before any call to the model.
Do I need a different model per use case?
Often yes: an economy model handles summarisation, a stronger model is justified for complex reasoning. We test both during the PoC to arbitrate cost vs quality.
Let's scope your project. Tell us your priority use case, monthly volume and indicative budget (8,000-25,000 EUR for a PoC): we scope the perimeter and API cost. 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.
