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: 41.2%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 406 | 29.1% |
| OpenAI Codex | OpenAI | 17 | 1.2% |
| Cursor Agent | Anysphere | 1 | 0.1% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
9110d5baFix simulated longjmp on FreeBSD/AArch64 (#62968)Claude Codefd4b58c3gf: fix bug in has_ambig computation, improve accuracy with union of candiClaude Code2f4f6976Call jl_init_options from jl_autoinit_and_adopt_thread (#62883)Claude Code2fefd012lowering: in-place broadcast returns the lhs (#61846)OpenAI Codex80c56e6fscopedvalues: Fold reads from enclosing scopes (#62762)OpenAI Codex3e9e9a0dcontrib/asan: reduce sanitizer overhead (#62783)OpenAI Codex21696f4d[docs] Document `WITH_NVTX` build option (#62271)Cursor Agent
What was excluded
| Commits in window | 1,448 |
| Merge commits removed | −44 |
| CI / dependency bots removed | −7 |
| Considered | 1,397 |
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 JuliaLang/julia