You have been quoted $400K by a Big 4 firm
You have been quoted $400,000 by a Big 4 firm for a 9-month AI strategy engagement. The partner was excellent. The deck was excellent. The scope has five workstreams, a steering committee, and a readout cadence. You looked at the line item next to the partner's name and did the math on what an associate actually costs, and something did not add up. You are running a company with 70 people and $40M in revenue. You need something that ships, not something that presents.
The condition is that AI is a board-level line item now and everyone selling into the mid-market knows it. The reality is that most of what is being sold to mid-market operators was built for Fortune 500 budgets, then priced down, with the margin preserved by cutting the senior time and adding junior hours. What to do is to stop comparing proposals by the logo on the cover and start comparing them by who does the work, what ships, and what you own at the end.
Fractional Head of AI vs Big 4, side by side
Nine dimensions that matter for a mid-market operator. The numbers below are the published Work-Smart.ai ranges and the Big 4 ranges I have seen quoted to clients in the $5M to $100M revenue band over the last 18 months.
| Dimension | Fractional Head of AI | Traditional consultant / Big 4 |
|---|---|---|
| Who does the work | Ignacio directly, embedded part-time in your operation. | A junior team. The partner shows up on kickoff and steering calls. |
| Engagement shape | Phased, monthly retainer, no long-term lock-in. | Fixed scope, 6 to 12 month SOW, change orders for anything off-plan. |
| Cost for a mid-market operator | $5K to $12K audit. $10K to $50K build. $5K to $12K per month retained. | $200K to $500K+ for a comparable statement of work. |
| Time to first working system | 2 to 3 weeks for the audit. 4 to 16 weeks for the build. | 3 to 6 months of discovery and workshops before anything ships. |
| What you get at the end | Production systems your team owns and operates. | A deck and a roadmap. Implementation is usually a separate SOW. |
| Customization | Built on your data, your tools, your workflows, your language. | Reference architectures, adapted to your context. |
| Lock-in | None. Everything is yours. Leave any month. | Ongoing dependency is the business model. |
| Accountability | One person, one phone number. | Account team, engagement manager, partner, escalation chain. |
| Best fit | 20 to 500 employees, $5M to $100M revenue. | Enterprise and Fortune 500 with global scope. |
The row that decides most engagements is "who does the work." On a Big 4 engagement, the partner you trust is not the person on the keyboard. On a Fractional Head of AI engagement, the person on the keyboard is the person on the call. That is not a small difference. It is the whole thing.
When a Big 4 firm is actually the right choice
If you are Fortune 500, you need a 12-person team, a global rollout, a change management workstream, and a vendor that carries the risk at scale. That is not me. A Big 4 firm is built for that. If you are running a multinational with regulated operations in 15 countries, if your board wants a brand-name signature on the engagement, if you need professional indemnity insurance measured in the tens of millions, call the Big 4. That work exists and it is real work.
If you are 20 to 500 employees and you want something that ships in weeks, not months, keep reading.
When a Fractional Head of AI is the right choice
You are a mid-market operator. 20 to 500 employees, $5M to $100M in revenue. The CEO, COO, or CFO is the one pushing AI forward because nobody else has the bandwidth to own it. You do not need a 12-person team. You need one person who has done this before, who will sit inside your operation for a few days a month, and who will leave behind production systems your team can run.
You want a partner who ships, not a deck that sits. You want a monthly engagement you can end any month, not a 12-month SOW with change orders. You want the person who sells you the work to be the person who does the work. That is the shape of a Fractional Head of AI engagement. The service page has the exact pricing, deliverables, and engagement phases.
A $14B wealth advisory firm that was quoted by a Big 4
A $14B wealth advisory firm I worked with was quoted a mid-six-figure statement of work by a Big 4 firm for an AI strategy engagement. Nine months. Four workstreams. Two dozen interviews. A readout every six weeks. The CFO asked me, in the first 10 minutes of the first call, two questions. What does this cost. What do I get.
We did a 3-week audit instead. I spent the first week inside the operation, talking to the people who actually did the work, and looking at the data layer. The audit deliverable was a baseline across three workflows, a sized list of the top leaks, and a 90-day build plan with a monthly ROI reporting format the CFO could audit. The audit cost less than one week of the Big 4 quote. By the end of month 3 of the build, the first monthly report showed hours saved, revenue recovered, and decision latency reduced, all against the baselines we set in week 1. The Big 4 engagement, in the same 3 months, would still have been in discovery.
The point is not that the Big 4 firm was wrong. The point is that they were built for a different operator. The CFO at this firm did not need a deck. He needed a baseline, a build, and a report. That is the entire case for the fractional shape.