12.8%

of 1,693 commits were committed by an AI agent — a floor, not an estimate

12.8% agent · top contributor 57.1%36 contributors

team

A small group is using agents. Adoption has spread beyond one person but is not project-wide.

217

agent commits

1,476

human commits

agent contributors

57.1%

largest contributor

Assisted or autonomous

213assisted

4autonomous

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: 20.6%. Bars are scaled to that peak, not to 100%.

Which agents

Claude Code	Anthropic	171	10.1%
Cursor Agent	Anysphere	48	2.8%
GitHub Copilot	GitHub	1	0.1%

Verify it yourself

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

5366b7bafix(minimax): support 480P and 768P video resolutions (#20004)Claude Code
86892f3ffix(openai-compatible): preserve unmapped usage fields in usage.raw (#1856Claude Code
39bd17ebfix(harness-pi): deliver tool results submitted after cross-process resumeClaude Code
7439d7abfix(openai): restore responses workflow deserialization (#15589)Cursor Agent
79e133ccfeat(video): externalize polling control and webhook support for generateVCursor Agent
86a84c90fix(harness): emit an abort part instead of an AbortError error part when Cursor Agent
ed313f7eci(release): delete pre.json before snapshot versioning to support beta reGitHub Copilot

What was excluded

Commits in window	2,634
Merge commits removed	−0
CI / dependency bots removed	−941
Considered	1,693

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/ai

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