Anthropic research shows developers using AI assistance scored 17% lower on comprehension tests when learning new coding libraries, though productivity gains were not statistically significant. Those

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A randomized controlled trial by Anthropic found that developers using AI coding assistants scored 17% lower on comprehension tests compared to those coding manually, with no statistically significant productivity gains. The study of 52 junior engineers learning the Trio async Python library revealed that how developers use AI matters more than whether they use it: those who delegated code generation to AI scored below 40%, while those using AI for conceptual questions scored 65% or higher. A corroborating 2024 academic study on React learners found similar patterns. Anthropic recommends intentional AI tool design that supports learning, and both Anthropic and OpenAI now offer dedicated learning modes (Claude Code's Learning mode and ChatGPT Study Mode) to prioritize comprehension over delegation.

Anthropic Study: AI Coding Assistance Reduces Developer Skill Mastery by 17%