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chromium/chromium ↗
0.1%
of 120,843 commits were committed by an AI agent — a floor, not an estimate
0.1% agent · top contributor 37.6%26 contributors
org-wide

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

109
agent commits
120,734
human commits
26
agent contributors
37.6%
largest contributor

Assisted or autonomous

109assisted
0autonomous

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

Jan26
Feb26
Mar26
Apr26
May26
Jun26
Jul26
Aug26
Sep26

Peak month: 0.2%. Bars are scaled to that peak, not to 100%.

Which agents

GitHub CopilotGitHub460%
Gemini CLIGoogle430%
Claude CodeAnthropic200%

Verify it yourself

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

  • 80478936Make TabStatsTracker histogram names constexprGitHub Copilot
  • 342a408aFix macOS-specific race condition for SystemAccentColor testGitHub Copilot
  • a9a29577[Extensions] Externalize feature handlersGitHub Copilot
  • 85c31c00WebView.prefetch: Fix AwPrerenderTest#testPrerenderAndSaveState by waitingGemini CLI
  • b1191df0WebViewPaop: Add fieldtrial testing config for WebViewPrefetchAheadOfPrereGemini CLI
  • c099bd18WebViewPAOP: Split AwPrerenderTest tests into PAOP enabled/disabled varianGemini CLI
  • 724ebc43[ash] wallpaper_handlers: drop chrome/browser/signin dependencyClaude Code
  • 74b6935d[ash] os_feedback: drop chrome/browser/signin dependencyClaude Code
  • 3e0b8bc6[ash] arc/optin: drop unused chrome/browser/signin dependencyClaude Code

What was excluded

Commits in window120,888
Merge commits removed−1
CI / dependency bots removed−44
Considered120,843

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 chromium/chromium

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