Three kinds of agency, and only one of them is fine
When I look at how agencies are responding to this, I see roughly three postures. They are not all equally durable.
The integration shop. This agency leads with technical capability: we connect your systems to the model, we fine-tune, we deploy. The problem is that this work is becoming faster and cheaper with every platform release. What took a team of four engineers six weeks in early 2023 can now be done by one engineer in a week using the lab's own tooling. The labs are also building no-code and low-code surfaces specifically to remove the need for this layer. Integration as a primary offer has a compression problem.
The AI strategy consultancy. This agency sells thinking. workshops, roadmaps, maturity assessments, frameworks with proprietary names. The risk here is that the labs are now funding their own thought leadership, publishing their own research on enterprise adoption, and embedding their own strategists into major accounts as part of enterprise agreements. When the vendor can give you strategy for free as part of a six-figure software deal, standalone strategy becomes a harder sell.
The product studio. This agency builds things the client will own: products, interfaces, workflows, internal tools. The relationship to any specific model is secondary. The primary offer is design and product judgment, and the AI capability is in service of that. This is the position that is structurally more defensible, because the labs cannot easily replicate it without becoming something they are not, which is a product studio.
None of these categories are pure. Most agencies are a blend. But the direction of travel matters.