Every AI vendor will tell you to buy. Every engineering team will tell you to build. The right answer depends on something neither side talks about: your rate of change.
The vendor pitch
Buy a platform. Configure it. Deploy in weeks. The vendor handles updates, scaling, and compliance. You focus on your core business.
This pitch is compelling because it is partly true. For stable, well-defined problems with standard workflows, buying is almost always the right call. You do not need to build your own email system. You do not need to build your own CRM.
The build pitch
Your business is unique. Off-the-shelf solutions will never fit perfectly. You will spend more time configuring a vendor tool than building your own. Plus, you own the IP.
This pitch is also partly true. For problems at the core of your competitive advantage, building gives you leverage that buying never will.
What neither side tells you
The real question is not build vs. buy. It is how fast your requirements change.
If your workflow is stable and well-understood, buy. The vendor has already solved the edge cases you have not thought of yet.
If your workflow is evolving quickly, if you are still figuring out what good looks like, build. Not because building is better, but because the cost of changing a vendor integration every two weeks is higher than the cost of changing your own code.
The hybrid approach
The best companies do both. They buy commodity infrastructure. They build competitive differentiators. And they have a clear framework for deciding which is which.
The framework is simple: if your competitors could use the same tool with the same configuration and get the same results, buy it. If the way you use the tool is itself a competitive advantage, build it.