McKinsey runs 20,000 AI agents. Here's what that means for consulting
McKinsey now operates with 40,000 humans and 20,000 AI agents. What that ratio means for anyone who buys consulting — and why the old model doesn't survive it.
In March 2026, McKinsey publicly disclosed its workforce composition: 40,000 humans and 20,000 AI agents. This isn’t a pilot program or a slide from an HR innovation deck. It’s the operating structure of one of the most traditional consulting firms in the world.
I spent two decades building enterprise search before founding Arvor. I watched large companies treat AI as a separate department — an “innovation team” that never touches the core business. McKinsey’s move is the opposite: agents embedded in delivery, working alongside people, part of the actual product the client pays for.
And the number that matters isn’t the total agent count — it’s the ratio. One executive at the firm put it plainly: “what used to require 14 consultants now needs 2 to 3 people plus agents”. That’s not marginal productivity gain. That’s a business model rebuilt from the ground up.
The cuts came before the agents
McKinsey didn’t arrive at 20,000 agents by accident or overnight. The firm had already been shrinking its human headcount — from 45,000 to 40,000 employees since 2023, including roughly 200 staff cuts in 2025. The agents didn’t replace those people afterward. They were built to operate in the space the restructuring opened up.
That’s the pattern any company serious about adopting agents will run into: redesign the process first, then automate what’s left. Companies that try to bolt agents onto an unchanged structure tend to spend money without seeing returns.
The market backing this bet
McKinsey’s move isn’t isolated. The agentic AI market is projected to grow from $7.55 billion in 2025 to $199 billion by 2034 — more than 25x growth in under a decade. Gartner has already logged a +1,445% jump in multi-agent inquiries over the last cycle.
That means every major consultancy — and every company that buys consulting — is heading toward the same dilemma McKinsey already resolved for itself: keep the billable-hours-per-junior-analyst model, or redesign delivery around specialist agents supervised by a handful of seniors.
What this means if you buy consulting
If one of the largest consultancies on the planet already runs a third of its workforce as agents, the “this isn’t mature enough for my industry” argument doesn’t hold anymore. The question isn’t whether agents enter the operation. It’s who builds and runs those agents for you: a giant internal team, an expensive-hour consultancy, or a lean, specialized outfit.
At Arvor, that’s exactly the space we occupy. We don’t sell generic consultant hours — we build and operate the agents that do the work, with human oversight where it counts. If your company is weighing the same dilemma that pushed McKinsey to turn 20,000 positions into agents, it’s worth talking to people who’ve already built this kind of system. Check out BRAIN MAKER or reach out directly via contact.