repository · survival report #4 · 2026-10-05 · method v3 · unranked

vercel/next.js

In Survival Report #4 (2026-10-05, method v3): 48,146 of 62,707 lines introduced by 247 AI-tagged commits are still at HEAD, 76.8 %. These are counts, not grades. No rank, no colour, no verdict, and no comparison with any other repository on this page. Every number links to the audit bytes behind it and the method and its limits are public.

GitHub · latest.json · badge.svg · Survival Report #4 · all repositories · Atom feed

247AI-tagged commits · of 35,834 62,707lines introduced by them 48,146still attributed to them at HEAD 76.8 %line-weighted 82.5 %median per commit 7 %of introduced lines in the largest commit

Baseline: this repository's untagged lines

Commits with no machine-readable AI signal, human-written, inline-completed or untagged-agent code alike: 35,584 commits, 12,970,894 lines introduced, 2,818,108 still at HEAD (21.7 % line-weighted, 12.9 % median per commit). Age is the time from a commit to HEAD. Method v3; definition at causari.dev/method.

Age-matched: AI-tagged lines 76.8 % against untagged lines of the same age 61.7 %, a gap of +15.1 pts, over 5 age windows holding 100 % of the AI-tagged lines.

Line ageAI-taggedcommitsUntaggedcommits
0–30 d88.8 %3182.7 %495
30–90 d88.0 %4468.2 %851
90–180 d69.7 %6454.6 %1,029
180–365 d65.6 %10354.1 %2,376
365–730 d74.3 %541.1 %6,074
730+ d—013.5 %24,759

By agent, in Survival Report #4

Alphabetical. A commit is attributed to the agent its metadata names; one agent per commit. VERIFIED commits only.

AgentCommitsLines introducedStill at HEADLine-weightedCapped
claude-code18552,15141,68279.9 %76.4 %
cursor5310,0086,08160.8 %68.7 %
devin346834874.4 %74.4 %
github-copilot6803543.8 %43.8 %

History across reports

One row per report this repository was measured in, oldest first; each report measured HEAD as of its own date. The line is the line-weighted ratio on a fixed 0 – 100 % axis; each point is one report.

Line-weighted ratio across reports, 0 to 100 %: #2 77.1 %; #3 77.0 %; #4 76.8 %
ReportDateAI-tagged commitsLines introducedStill at HEADLine-weighted
Survival Report #22026-09-2322458,02544,76277.1 %
Survival Report #32026-09-2823659,46045,77477.0 %
Survival Report #42026-10-0524762,70748,14676.8 %

Reproduce

One command, any machine, no account: the same bytes the report was built from. The exact bytes behind this page are repos/vercel__next.js.json of Survival Report #4. Open an issue with your JSON if it differs.

re audit vercel/next.js --json   # method v3, full clone

Badge

Text only, one colour, no red and no green. It follows the latest report and is cached for one hour. badge-dark.svg is the same badge as paper on ink.

AI code survival 76.8 % · causari · #4 AI code survival 76.8 % · causari · #4, paper on ink

README · Markdown
[![AI code survival](https://causari.dev/r/vercel/next.js/badge.svg)](https://causari.dev/r/vercel/next.js/)

Coverage

  • Method v3, causari 0.3.0. Detection from commit metadata only; survival from git blame -w -M -C at HEAD.
  • Full clone: yes. Method v3 refuses shallow clones; this row comes from a complete history.
  • Sample: 247 AI-tagged commits; the sample floor is 5. At or above the floor, so the ratio is aggregated into the report.
  • PROBABLE: 3 PROBABLE commits (13 lines introduced, 13 still at HEAD) are listed here and never summed into the VERIFIED counts.
  • Cap: 1,095 lines per commit in this repository; the capped ratio is 74.0 %.
  • .git-blame-ignore-revs: honoured.