Observational study of Claude Code and GitHub Copilot CLI at Microsoft finds social-network-driven adoption, activity-linked retention, and a persistent 24% lift in merged pull requests among adopters.
Coding Beyond Your Training: Claude Code and the Technological Frontier of Software Developers
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abstract
We study whether adoption of an AI coding assistant causally expands the technological frontier of individual software developers. We exploit the staggered rollout of Claude Code across GitHub between May 2025 and January 2026 in a panel of 5,838 developers observed monthly over 28 months, with treatment defined by the developer's first Claude-co-authored commit and not-yet-treated developers as controls. Using the doubly robust Callaway and Sant'Anna (2021) estimator, we find positive and significant effects on monthly commits (+41), repositories contributed to (+1.5), distinct programming languages used (+0.83), Shannon language entropy (+0.14), newly-used languages (+0.31), and cumulative lifetime languages (+0.51). The cumulative-languages effect grows with time since adoption, matching a Bayesian-learning model in which AI provides free signals about unfamiliar technologies and lowers the switching barrier. Results are robust to two stricter activity filters. The estimates document a sharp, persistent shift in developer behavior coincident with AI adoption; identification limits prevent a strict causal claim and we outline an agenda for cleaner tests.
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2026 1verdicts
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Adoption and Impact of Command-Line AI Coding Agents: A Study of Microsoft's Early 2026 Rollout of Claude Code and GitHub Copilot CLI
Observational study of Claude Code and GitHub Copilot CLI at Microsoft finds social-network-driven adoption, activity-linked retention, and a persistent 24% lift in merged pull requests among adopters.