A small group is using agents. Adoption has spread beyond one person but is not project-wide.
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: 98%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 657 | 61.7% |
| OpenAI Codex | OpenAI | 2 | 0.2% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
f1fbdfbav0.50.1.0 fix: community fix wave — 21 PR adoptions + 35 verified issue fiClaude Code43597b19v0.48.5.0 fix: community fix wave — 57 PR adoptions + 42 verified issue fiClaude Code2efaaf8fv0.48.4.0 feat(search,eval): ranker wave — autocut off, relational rerank Claude Code77bb9d8cv0.46.32.0 fix: wave-k community train — 54 contributor PRs absorbed, recoOpenAI Codex87840341v0.31.7 fix-wave: doctor stops crying wolf — 5 community PRs (#798 + #788 OpenAI Codex
What was excluded
| Commits in window | 1,068 |
| Merge commits removed | −4 |
| CI / dependency bots removed | −0 |
| Considered | 1,064 |
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 garrytan/gbrain