Adoption is broad. Many contributors are committing agent-authored work, which is what a real organisational rollout looks like.
Assisted or autonomous
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
Peak month: 16%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 107 | 1.4% |
| OpenAI Codex | OpenAI | 49 | 0.6% |
| GitHub Copilot | GitHub | 47 | 0.6% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
a089158echore(lite): bump @gitbutler/design-core to 3.17.2Claude Codef1c863destyle(Field): use text-3 for the labelClaude Code34abc52fstyle(Popup): swap the not-found illustration for papersClaude Code781d706eFix but-meta virtual-branches.toml cleanup which didn't deal with duplicatOpenAI Codex267df200Address Codex reviewOpenAI Codex33d42ba9More git2 to gix substitutionsOpenAI Codex85b5da73Fix scan-pr by bumping qs override to 6.15.2GitHub Copilota555420cFix scan-pr OSV dependency vulnerabilitiesGitHub Copilot5dded467watch refs, but ignore locksGitHub Copilot
What was excluded
| Commits in window | 10,646 |
| Merge commits removed | −2,939 |
| CI / dependency bots removed | −119 |
| Considered | 7,588 |
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 gitbutlerapp/gitbutler