The jetbrains icse study tracked 800 developers over two years — 151 million ide events — and found…
the jetbrains icse study tracked 800 developers over two years — 151 million ide events — and found ai users delete about 100 more lines a month than non-users, who delete 7.6. 74% of ai users never noticed the extra window switching the telemetry shows.
perception of ai productivity is running ahead of what the logs say.
Context
The ICSE 2026 research-track paper Evolving with AI: A Longitudinal Analysis of Developer Logs, by authors from JetBrains Research, is a mixed-method study combining two-year fine-grained telemetry from 800 developers with a survey of 62 professionals across productivity, code quality, code editing, code reuse and context switching. It reports AI users produce substantially more code but also delete significantly more.
The 800 developers, two years and the method are first-party. The 151 million IDE events, about 100 more deleted lines a month versus 7.6, and 74% of AI users not noticing window switching were not in the abstract read. The survey sample was 62, so a 74% of AI users figure would be a survey statistic. Those figures are unverified, and the period dates are not stated on the page. The closing perception claim is the author's opinion.
Watch next
- The full paper's figures and period.
Sources
- Evolving with AI (ICSE 2026 research track)conf.researchr.org
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 18 September 2026 at 15:58 IST. Sources are the papers and datasets the note draws on.
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