--- title: "How Much Code Do Developers Really Let Agents Write?" url: https://daily.dev/posts/how-much-code-do-developers-really-let-agents-write--oxbt40nkb source_url: https://blog.jetbrains.com/research/2026/08/how-much-code-do-developers-really-let-agents-write type: article source: "JetBrains" published: 2026-08-26T18:30:58.585Z updated: 2026-08-26T18:31:28.031Z tags: ["claude-code", "openai-codex"] reading_time: 7 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # How Much Code Do Developers Really Let Agents Write? **[JetBrains](https://daily.dev/sources/jetbrains)** · 7 min read · 0 upvotes · 0 comments ## Summary 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). ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions 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._ ## Similar posts on daily.dev - [AI Coding Agents: Adoption Trends](https://daily.dev/posts/ai-coding-agents-adoption-trends-qx3t0tttk) · JetBrains · 1 upvotes · 0 comments - [Agents on a leash: Agentic AI remains mostly single-agent and monitored at work](https://daily.dev/posts/agents-on-a-leash-agentic-ai-remains-mostly-single-agent-and-monitored-at-work-f8ug4owkn) · Stack Overflow Blog · 1 upvotes · 0 comments --- Tags: [#claude-code](https://daily.dev/tags/claude-code), [#openai-codex](https://daily.dev/tags/openai-codex) [View this post on daily.dev](https://daily.dev/posts/how-much-code-do-developers-really-let-agents-write--oxbt40nkb)