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7.3%
of 2,712 commits were committed by an AI agent — a floor, not an estimate
7.3% agent · top contributor 45.7%28 contributors
org-wide

Adoption is broad. Many contributors are committing agent-authored work, which is what a real organisational rollout looks like.

199
agent commits
2,513
human commits
28
agent contributors
45.7%
largest contributor

Assisted or autonomous

197assisted
2autonomous

Assisted — a developer’s identity authored the commit and the agent added itself as co-author. The agent ran git commit during a working session, with a person there. Autonomous — a bot identity is the author, no human in the loop. Across the whole index, 93.7% of agent commits are assisted.

Agent share by month

Feb26
Mar26
Apr26
May26
Jun26
Jul26
Aug26
Sep26

Peak month: 23.5%. Bars are scaled to that peak, not to 100%.

Which agents

Claude CodeAnthropic1535.6%
Cursor AgentAnysphere431.6%
GitHub CopilotGitHub40.1%

Verify it yourself

Sample commits that matched. Every one links to GitHub — check the trailers.

  • 5b8c866c[test] Skip hooks of suites skipped by a lazy `@force-gate` (#98169)Claude Code
  • 52cd5b96Skip discussions in the `issue_lock` workflow (#98146)Claude Code
  • 3866d6fd[ci] Fix `issue_lock` (#97755)Claude Code
  • 1780fa03fix: reuse a single drain listener when piping Node streams through gzip (Cursor Agent
  • 8aa475b4Redesign the unrendered-segment instant validation overlay (#93879)Cursor Agent
  • 1a1d1c97ci: run Linux Playwright jobs in prebuilt Microsoft container (#93794)Cursor Agent
  • d4b23403docs: clarify /_not-found failures and <html> attribute reads under Cache GitHub Copilot
  • 9e344c92skill(next-cache-components-adoption): tune skill to mention app router reGitHub Copilot
  • 8adb4ea8[test] Fix broken terminal output (#93357)GitHub Copilot

What was excluded

Commits in window2,955
Merge commits removed−0
CI / dependency bots removed−243
Considered2,712

Bots are excluded from the denominator entirely. Counting dependabot as “AI-written code” is the fastest way to produce a meaningless number.

How this was measured

Measured over February–August 2026, cloned directly. Detection is deterministic string matching against signatures agents write about themselves — no heuristics, no style analysis. Merge commits and CI bots are excluded from the denominator. The figure is a floor: squash merges strip trailers, so real usage is higher. Contributor counts are aggregate — no individual is named.

Run it yourself: npx qmmit-cli vercel/next.js

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