Generative AI often delivers its largest productivity gains to less-experienced workers. Controlled experiments and workplace field studies show that generative AI assistance can improve productivity, often with the largest gains among novice, junior, or lower-performing workers. Effects vary by task and implementation, and some studies find limited or negative effects for experienced workers, but those qualifications do not contradict the claim's carefully bounded wording. The Short Version Controlled experiments and workplace field studies show that generative AI assistance can improve productivity, often with the largest gains among novice, junior, or lower-performing workers. Effects vary by task and implementation, and some studies find limited or negative effects for experienced workers, but those qualifications do not contradict the claim’s carefully bounded wording.