Jetbrains' 15k-dev survey says claude code hit 39% adoption while copilot slid from 29% to 21% in a…
jetbrains' 15k-dev survey says claude code hit 39% adoption while copilot slid from 29% to 21% in a year, with 90% of devs on agents weekly. the ai coding market just picked its winner and it wasn't the incumbent.
the question now is who survives as the second agent in the toolchain.
Context
JetBrains' research blog of 18 August 2026 reports its Developer Ecosystem Survey 2026, the tenth edition, of more than 15,000 professional developers. For May to July 2026 it reports 39% using Claude Code at work, up from 18% in January 2026 and 47% in the US, GitHub Copilot down from 29% a year earlier to 21%, Codex up from 3% to 16%, Cursor down from 18% to 12%, and 90% using AI coding agents at work at least weekly, 68% daily.
Adoption here means use at work in a self-reported survey of professional developers, not market share. The 90% is for any AI coding agent, not Claude Code. JetBrains calls the sample globally representative; its recruitment and weighting were not inspected. One outlet's snippet gives 15,509 respondents, which is not first-party. Picked its winner and who survives as the second agent are the author's opinion.
Watch next
- JetBrains' full report and methodology, and the next survey wave.
Sources
- AI coding agent adoption 2026 (JetBrains Research, 18 Aug 2026)blog.jetbrains.com
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 18 September 2026 at 06:16 IST. Sources are the papers and datasets the note draws on.
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