Swiss typography, the international style, made a hard bet in the 1950s. The reader is busy. Ornament is a tax. The grid, the type, and the hierarchy should make the content unmistakable, and the designer should get out of the way. It is an ethic before it is a look.
Most AI interfaces invert it. They wrap a guess in a personality, a gradient, and a paragraph of warmth, and hope the reader feels helped. The reader wanted to know whether the number was real.
hierarchy is how you tell the truth
Put the decision first. Then the evidence. Then the caveat. Not the other way around, and not all in the same visual weight. If everything is a chat message, everything is the same importance, which means nothing is. A person scanning for the answer should not have to read the machine's manners to find it.
Uncertainty is content. Give it a place in the hierarchy instead of a tooltip.
Clarity is not a style you apply after the model answers. It is the decision about what the answer is.
remove until the point remains
When we design these screens we cut. The greeting. The suggestion to ask anything. The second chart that repeats the first. What survives is the claim, the source, and the action a person can take. If removing an element does not hurt comprehension, it was not doing a job.
You do not have to imitate a Swiss poster. You do have to take the reader's time as seriously as they did. An AI interface that makes someone hunt for the point has already failed, however clever the model behind it.