How Much Code Do Developers Really Let Agents Write?
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JetBrains' Developer Ecosystem Survey 2026, covering over 15,000 professional developers, found that on average 47% of code is now fully generated by AI agents, 38% is written with AI assistance, and only 27% is written fully manually. One in five developers writes zero manual code, but only about 22% rely on agents for over 80% of their code. Senior developers adopt fully agentic workflows faster than juniors. Among tool users, 42% of Codex users and 32% of Claude Code users generate over 80% of their code with agents; Cursor users average 58% agent-generated code. Go, JavaScript, and TypeScript developers show the highest agentic adoption (54-55%), while C/C++ developers remain the least agentic (38% manual). East Asian developers (China, Japan, South Korea) lead adoption at 32-35% heavy agentic use, roughly double the rate in Europe and the UK. Three developer segments emerged: Agentic coders (~31%, 84% agent-generated), AI-assisted coders (~47%, 40% agent-generated), and Manual coders (~23%, ~10% agent-generated).
Table of contents
Agentic coding by professional experienceAgentic coding by most-used AI coding toolsAgentic coding by main programming languageAgentic coding by regionsSegments of developers by AI usageMethodology notesQuestions this post answers
What percentage of code do developers let AI agents fully write on average?
On average, professional developers report that about 47% of the code they produce for work is fully generated by AI agents, 38% is written with some AI assistance, and 27% is written fully manually, based on a 2026 survey of over 15,000 professional developers. About 22% of developers generate more than 80% of their code using agents. Compare agentic coding adoption trends and tool choices with developers tracking the shift on daily.dev.
Which AI coding tool users generate the highest share of agent-written code, Claude Code or Codex?
Codex users report a higher share of heavy agentic coding than Claude Code users: 42% of Codex users generate over 80% of their code with agents, compared with 32% of Claude Code users. Codex also has a higher share of users who write zero code without AI assistance, at 37%, versus lower rates for other tools. Cursor users average 58% agent-generated code, with 28% generating over 80%. Weigh Codex against Claude Code and Cursor before betting a workflow on one agentic tool.
Which programming languages have the highest and lowest adoption of AI agent-generated code?
Go, JavaScript, and TypeScript developers report the highest agent-generated code shares, averaging 54%-55%, while C and C++ developers remain the least agentic, keeping 38% of their code manually written on average. Java and Python developers fall in the middle, with 48%-51% of their code generated by agents. Track how agentic coding adoption differs by language before adjusting your own team's workflow.