AI BriefingStudy of 450 GitHub repos finds Claude Code signs most AI PRs in 279 of 383 active repos
·2026.11.06 23:05
Key point
Analysis of 12 months of merged PRs shows the average repo's AI-signed share rose from 2.3% to 10.3%, though the median remains at 0.9%.
Details
- Claude Code is the most frequent signer of AI-generated PRs in 279 of the 383 repos with any AI signatures, followed by Copilot's coding agent (41), Copilot CLI (24), Cursor (13), and Codex (12).
- The average share of AI-signed PRs increased from 2.3% to 10.3% over the year, but the median repo remains at 0.9%, indicating a minority of repositories drive the average.
- AI-signed PRs are on average 2.1 times larger than non-AI PRs, yet AI-heavy TypeScript and C# repos did not show increased code complexity per line unless the codebase was also growing rapidly.
- 264 of the 450 analyzed repos have committed agent instruction files (such as AGENTS.md or CLAUDE.md), but half of these sign fewer than 5% of their PRs; for example, Angular had 4,037 merged PRs with zero AI signals despite having an AGENTS.md.
- The data covers 12 months (Oct 2025 to Sep 2026) across 9 languages and counts co-author trailers, bot authors, and agent branches; the authors note these figures are floors because most tools do not add signatures by default.
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