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: 1.5%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 22 | 0.5% |
| Gemini CLI | 6 | 0.1% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
a4d0ba21[pallas] Fix dropped writes to aliased outputs in the HLO interpreter.Claude Code036973f9Make `api_util.fun_sourceinfo` better at nested wrapped + partial'd functiClaude Codeebfefa17Add mTLS support to `jax.distributed` coordination serviceClaude Codeda0f7aceMinor formatting fix for SparseCore specs tableGemini CLIe52e3066Apply suggestion from @gemini-code-assist[bot]Gemini CLI4015de85Update tests/experimental_rnn_test.pyGemini CLI
What was excluded
| Commits in window | 5,228 |
| Merge commits removed | −886 |
| CI / dependency bots removed | −24 |
| Considered | 4,318 |
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 jax-ml/jax