The verdict in three sentences
A generative AI assistant on a document base for a firm costs in 2026 12,000 to 45,000 EUR to set up, plus a monthly API of 150 to 1,200 EUR. With confidentiality guardrails and systematic human validation, it cuts 30 to 60 % of drafting time on first drafts (contracts, memos, reports). EU data hosting is recommended, and quality control stays in the partners' hands.
What an AI drafting assistant costs in 2026
The budget depends on document volume, the security level required and the number of document templates. 2026 orders of magnitude for a European firm.
| Plan | Scope | Setup (EUR) | API /month (EUR) |
|---|---|---|---|
| Pilot | 1 document type, 1 team | 12,000 to 18,000 | 150 to 350 |
| Firm | 3 to 5 templates, internal base | 20,000 to 30,000 | 400 to 700 |
| Advanced | Multi-practice + hardened security | 32,000 to 45,000 | 800 to 1,200 |
| Bespoke | DMS integration + audit trail | 45,000 to 70,000 | 1,200 to 2,500 |
The API cost depends on the volume of documents processed and text length. A firm producing 300 documents per month typically consumes 400 to 700 EUR of API.
The productivity gain, with guardrails
AI speeds up the first draft; the human keeps final responsibility. 2026 estimate for a firm producing structured documents.
| Document type | Time without AI | Time with AI | Reduction |
|---|---|---|---|
| Standard contract | 3 h | 1.3 h | 57 % |
| Analysis memo | 4 h | 2 h | 50 % |
| Client report | 6 h | 3.3 h | 45 % |
| Template letter | 45 min | 15 min | 67 % |
| Case summary | 2.5 h | 1.2 h | 52 % |
The golden rule: AI proposes, the partner decides. Every document goes through a human review before sending, which preserves professional responsibility and quality.
Mini case study
Me Diop, partner of a 12-person consulting firm in Paris, deploys a Firm AI assistant at 26,000 EUR + 600 EUR per month. His associates draft 280 documents per month, at 2.5 hours on average, i.e. 700 hours monthly. AI cuts that time by 48 %, freeing 336 hours per month. Valued at a loaded cost of 60 EUR (senior profile), that is 20,160 EUR of freed capacity per month, reassigned to billable work. Setup and annual API (about 33,200 EUR) are amortised in under 2 months.
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FAQ
How much does an AI drafting assistant cost?
Between 12,000 and 45,000 EUR to set up in 2026, plus 150 to 1,200 EUR of API per month. A pilot on a single document type starts at 12,000 EUR.
Are my confidential documents protected?
Yes: EU hosting, data isolation and no public-model training. Confidentiality and the audit trail are part of the specification.
What time savings can I expect?
A reduction of 30 to 60 % in drafting time on first drafts depending on document type, with human review remaining systematic.
Can the AI make mistakes?
Yes, which is why every document goes through human validation before sending. AI speeds up the first draft but the partner keeps final responsibility.
How long to deploy it?
Budget 4 to 10 weeks depending on the number of templates and security level. A pilot can be operational in 3 to 4 weeks.
Let's scope your project. Tell us your document types, your monthly volume and your confidentiality requirements: we price setup, API and productivity gain. 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.
