Key takeaways
- Large consultancies are built for large problems. Rolling out AI assistants to 150 people is not one.
- The Big Four are worth it when you need regulatory depth, assurance, or a name your board or regulator will recognise.
- Boutiques usually win on seniority, speed and proportionate scope.
- Compare proposals on named people, fixed deliverables and end dates, not on decks.
If you run a mid-sized business and you search for AI transformation, most of what you find is written by firms with tens of thousands of staff. They are very good at what they do. What they do is not always what a 120 person company needs, and the mismatch is expensive.
How large firms deliver
Large consultancies run on a leverage model. A partner sells and oversees, a manager runs the engagement, and most of the hours are delivered by more junior consultants. That model works brilliantly for big, complex programmes that need many people working in parallel. It works less well for a contained project, because the overhead of the structure is a large share of the fee.
Large firms also tend to scope generously. A discovery phase, a current-state assessment, a target operating model, a roadmap and then implementation. Each phase is reasonable on its own. Together, for a business that needs a governed assistant rollout and some workflow automation, they can turn a six week job into six months.
When a large firm is the right call
- You are regulated in several jurisdictions and AI use touches decisions about customers, credit, health or employment, where the regulatory analysis is the hard part.
- You need assurance. An auditor, regulator or major client wants an independent opinion from a recognised firm.
- AI is part of a larger programme, such as an ERP replacement or a merger integration that a large firm is already running.
- Your board needs the name. This is a real consideration, not a cynical one. If a recognised brand is what gets the decision made, it can be worth paying for.
When a boutique or specialist is the better buy
- The core work is choosing, configuring and adopting AI tools for staff.
- You want the person you met in the sales meeting doing the work.
- You need to be live in weeks, not quarters.
- The budget is in the thousands or low tens of thousands rather than the hundreds of thousands.
The middle option people forget
You do not have to choose one firm for everything. A pattern that works well for mid-sized businesses is to use a specialist to get AI working across the organisation quickly, and to bring in a larger firm later for a specific high-stakes piece, such as a regulatory review of an automated decision process. That way you pay large-firm rates only for the part that needs them.
How to compare proposals fairly
| Ask | Why it matters |
|---|---|
| Who exactly will do the work, and for how many days each? | Shows the real seniority mix behind the day rate |
| What are the fixed deliverables? | Separates outputs from activity |
| What is the end date, and what happens if you miss it? | Tells you who carries the schedule risk |
| What will be live and in use at the end, not just documented? | Roadmaps are cheap. Working systems are the point |
| What do we own afterwards? | Policies, configurations and training materials should be yours |
For a fuller list of questions, read questions to ask an AI consultant before you hire them. For what different kinds of firm charge, see AI consulting pricing in 2026.
Frequently asked questions
Do Big Four firms work with small businesses on AI?
They do work with mid-market clients, but their delivery model and pricing are built for larger organisations. For a business of under a few hundred people adopting AI assistants, the engagement is usually larger and slower than the problem requires.
When is a large consultancy worth it for AI?
When the AI work is tied to something only a large firm does well: regulatory exposure across several jurisdictions, an audit or assurance requirement, a board that needs a recognised name, or integration with a large ERP or core system programme already under way.
What do boutique AI consultancies do better?
Speed, seniority and fit. You usually work with the person who wrote the proposal, decisions take days rather than weeks, and the scope is sized to your business. The trade-off is less depth on very large or regulated programmes.
How should we compare proposals from different sized firms?
Ask each for the named people who will do the work and their time allocation, the fixed deliverables, the end date, and what happens if it runs over. Compare those, not the slide decks.
Get a straight answer for your business
The Clarity Package gives you a written business case and a detailed implementation plan for 500 USD. The Implementation Package does the whole build, live in 30 days, for a fixed 5,000 USD.