Williams’ Law asserts that algorithmic innovations, rather than hardware scaling alone, drive exponential improvements in AI performance. This paper rigorously validates this principle by analyzing recent algorithmic breakthroughs, with a particular focus on the Chain of Draft (CoD) prompting paradigm. We formalize the performance function P(H,A), where H represents hardware capacity and A the algorithmic innovation index. We prove that improvements in A yield exponential performance growth even when H is fixed, whereas scaling H without algorithmic advances results in at most linear gains. Through empirical case studies in computer vision, natural language processing, and protein structure prediction, we demonstrate that “thinking smarter” through algorithmic innovation consistently outperforms “working harder” by scaling hardware. The CoD technique, recently proposed, exemplifies this principle, achieving comparable or superior accuracy to Chain-of-Thought (CoT) while using as little as 7.6% of the computational tokens, resulting in a 13× efficiency gain. We substantiate our analysis with formal mathematical proofs, graphical illustrations of linear versus exponential growth, and comparative analyses of key algorithmic milestones. Our results conclusively affirm Williams’ Law: enduring AI progress is driven by algorithmic innovation, underscoring the imperative to prioritize intellectual ingenuity over mere computational capacity.