repository · survival report #5 · 2026-10-12 · method v4 · unranked

vercel/next.js

In Survival Report #5 (2026-10-12, method v4): 52,325 of 67,391 lines introduced by 257 AI-tagged commits are still at HEAD, 77.6 %. 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 #5 · all repositories · Atom feed

257AI-tagged commits · of 35,967 67,391lines introduced by them 52,325still attributed to them at HEAD 77.6 %line-weighted 82.1 %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: 35,706 commits, 12,996,756 lines introduced, 2,833,393 still at HEAD (21.8 % line-weighted, 13.0 % median per commit). Age is the time from a commit to HEAD. The baseline was added in method v3 and is unchanged later; definition at causari.dev/method.

Age-matched: AI-tagged lines 77.6 % against untagged lines in the matched age windows 64.6 %, a gap of +13.1 pts, over 5 age windows holding 100 % of the AI-tagged lines.

Line ageAI-taggedcommitsUntaggedcommits
0–30 d89.5 %3782.0 %520
30–90 d88.0 %4870.6 %860
90–180 d68.5 %4660.6 %982
180–365 d67.7 %12151.5 %2,366
365–730 d74.3 %541.3 %6,058
730+ d—013.6 %24,920

By agent, in Survival Report #5

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

AgentCommitsLines introducedStill at HEADLine-weightedCapped
claude-code19455,92844,96780.4 %77.0 %
cursor5310,0086,07460.7 %68.7 %
devin346834874.4 %74.4 %
github-copilot798793694.8 %94.8 %

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 %; #5 77.6 %
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 %
Survival Report #52026-10-1225767,39152,32577.6 %

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 #5. Open an issue with your JSON if it differs.

re audit vercel/next.js --json   # method v4, 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 77.6 % · causari · #5 AI code survival 77.6 % · causari · #5, 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 v4, causari 0.4.1. Detection from commit metadata only; survival from git blame -w -M -C at HEAD.
  • Full clone: yes. Method v4 refuses shallow clones; this row comes from a complete history.
  • Sample: 257 AI-tagged commits; the sample floor is 5. At or above the floor, so the ratio is aggregated into the report.
  • PROBABLE: 4 PROBABLE commits (291 lines introduced, 235 still at HEAD) are listed here and never summed into the VERIFIED counts.
  • Cap: 1,321 lines per commit in this repository; the capped ratio is 75.4 %.
  • .git-blame-ignore-revs: honoured.