"How much does AI consulting cost?" is the most reasonable question a buyer can ask, and the hardest to answer in a sentence. The cost of building a chatbot prototype and the cost of putting a governed agent into production differ by an order of magnitude. What you can do is understand the pricing models, the factors that move the number, and how to avoid paying for a pilot that never ships.
The pricing models you will encounter
Most AI consultancies use one or a blend of these:
- Day rate / time-and-materials. You pay for senior time. Flexible, but the risk of overrun sits with you. Best for genuinely open-ended exploration.
- Fixed-fee discovery. A short, scoped engagement that maps the opportunity and produces a plan and ROI model for a set price. Low risk, high clarity.
- Milestone / fixed-scope delivery. A defined build for a fixed price, delivered in stages. Risk shifts to the consultancy.
- Value-based. Pricing tied to outcomes rather than headcount. Powerful when the value is measurable and both sides trust the baseline.
- Managed retainer. Ongoing operation — monitoring, evaluation, optimisation — for a recurring fee. This is how operated agent workflows are usually priced after launch.
What actually drives the cost
The model is rarely the expensive part. Cost is driven by everything around it:
- Scope. One bounded workflow is far cheaper than a programme of them.
- Data readiness. Clean, accessible data lowers cost; messy or siloed data raises it.
- Integration. The number and complexity of systems an agent must connect to safely.
- Governance. The level of oversight, evaluation and audit your risk profile requires.
- Operation. Whether you need the workflow run as a managed service or handed over.
Budget for production, not just a pilot
The most common — and most expensive — mistake is budgeting for a proof of concept and treating production as an afterthought. A demo is cheap; the value lives on the other side of the line, in the hardening, controls and integration that make an agent safe to run. We wrote about that gap in how to move AI pilots into production. Plan for it from the start and you avoid paying twice.
How Mach Lilies prices
We are deliberately transparent: most engagements begin with a free consultation and a fixed-scope Agentic Operations Sprint that produces a working prototype, an ROI model and a fixed-price rollout proposal — so you see clear numbers before committing to the build. After launch, operation is a managed retainer scoped to the number of agents and the oversight your risk profile needs. We price to outcomes, not headcount, and there is no lock-in. For a tailored quote, see AI consulting or get in touch.