Writing specifications is not always easy, but it is easier than writing the optimized implementation. And a powerful shortcut exists: an inefficient program that is obviously correct can serve as its own specification. User and AI co-write a simple model, AI writes an efficient version, and proves the two equivalent. The hard part shifts from implementation to design. That is the right kind of hard.
Nature, Published online: 24 February 2026; doi:10.1038/d41586-026-00561-5
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The national average is still below $3, but experts warn that could change quickly.