Siemens CEO Roland Busch says AI has a property that makes it unusable in his industry: ask it the same question twice and you get two different answers. "We are living in a world where failure is not an option." "You cannot launch a design of a car or a product, manufacture it, send it to the field and find out it doesn't work. This is not an option. It costs you so much money." "So each step from design to production, again to operation, has to be deterministic," he says, and has to meet safety and security requirements to the highest standard. "And think about it. When you ask AI a question today, the same question, you get different answers." "So this is not an option. You need an harness." His answer is that the deployable unit is not the model, but what you build around it: "You need domain know-how. You need a lot of data. And you need to have a kind of embedded harnesses which make sure that your models don't go off-road." He gives the example of uploading your product designs and asking AI for a new version. "You will get one. But eventually it will not work." His fix is a system that holds the contextualized data, plus physics-based simulation that "gives you always the boundaries. It works in the real world or it doesn't." He names Siemens' own Teamcenter as that system, and calls this "where I believe the monetization will take place" - his commercial bet, not a finding. When a wrong answer becomes a physical object, what matters is not the model's best answer but what constrains its worst one. - Roland Busch (@BuschRo), President and CEO of Siemens AG (@Siemens), with Marc Benioff at Dreamforce 2026.