Go, javascript and typescript developers now let agents write 54-55% of their code, while c and c++…
go, javascript and typescript developers now let agents write 54-55% of their code, while c and c++ devs keep 38% manual. the split isn’t about skill, it’s about safety rails, tooling maturity, and how much a segfault costs.
the language you work in decides how much of your job an agent gets.
Context
Verified: JetBrains' Developer Ecosystem Survey 2026, covered in its blog post How much code do developers really let agents write (Aug 26, 2026), surveyed over 15,000 professional developers in May to July 2026. Secondary summaries say that on average respondents report agents fully write about 47% of their code, 38% involves AI assistance and 27% is written fully manually.
DiffVibe (Oct 10, 2026) reports 39.8% of surveyed C++ developers now frequently use AI to write code, up from 30.9%, while 42% still rarely or never use it, citing incorrect output, privacy and cost.
The survey is JetBrains' and was published Aug 26, 2026. The 54-55% for Go, JavaScript and TypeScript and the 38% manual figure for C and C++ were not seen in the sources read, so unsupported here, not refuted. in the excerpts read; in the secondary summaries 38% is the overall share of AI-assisted code. The C++ side is consistent in direction with DiffVibe, which finds more AI use but less trust. 'The language you work in decides how much of your job an agent gets' is the author's opinion.
Related work
- Yomu: how much code do developers really let agents write ↗Summary of the JetBrains survey.
- Eazler: AI coding agent usage statistics 2026 ↗Sep 24, 2026.
- JetBrains research post ↗Aug 26, 2026.
Watch next
- Read the JetBrains post for the breakdown by language.
Sources
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 1 October 2026 at 10:19 IST. Sources are the papers and datasets the note draws on.
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