How Much Code Do Developers Really Let AI Write?
2026 Global Developer Ecosystem Survey reveals AI-assisted coding adoption rates worldwide.
1The AI Coding Revolution
According to the 2026 Global Developer Ecosystem Survey, professional developers on average let AI agents write 47% of their code entirely. 38% use some AI assistance, while only 27% code completely manually. The survey of over 15,000 professional developers conducted in May-July 2026 revealed that one in five developers no longer writes any code manually.
2Experience Matters
Interestingly, senior developers are leading the charge in delegating coding to AI. A quarter of senior developers have AI write over 80% of their code, while juniors tend to prefer AI-assisted workflows. However, not all seniors follow this trend; adoption rates vary significantly within this group.
3Tool-Specific Differences
There are notable differences among popular AI coding tools. 42% of Codex users have AI write over 80% of their code, compared to 32% of Claude Code users. 37% of Codex users don't write any code manually, a rate higher than users of other tools. Claude Code has become the industry standard with 39% workplace adoption.
4Tech Stack Impact
Programming languages show significant variations in AI adoption. Go, JavaScript and TypeScript developers have AI write 54-55% of their code on average, while C and C++ developers have the lowest rate (38%). Java and Python developers fall in the middle with 48-51%.
5Regional Variations
Geographical differences are striking. 32-35% of developers in China, Japan and South Korea have AI write the majority of their code, compared to about 16% in Europe and the UK. East Asia leads the world in AI-assisted coding adoption.
6Developer Segments
Developers fall into three distinct profiles based on AI usage: Agentic coders (31%) have AI write 84% of their code on average. AI-assisted coders (47%) delegate 40% to AI, while manual coders (23%) write 75% themselves.
7Industry Transformation
The rapid adoption of AI coding tools signals a major industry shift. Over half of all developers now write less than 20% of their code manually. Heavy users of tools like Claude Code and Codex are 46-57% agentic coders.
8Future Coding Practices
Survey results show purely manual coding is quickly becoming obsolete. AI-assisted development workflows are becoming the new standard, with most developers adopting hybrid approaches. This transformation promises lasting changes in software development efficiency and methodology.
Original article: The JetBrains Blog — Yazılımcılar Kodlarının Ne Kadarını Yapay Zekaya Yazdırıyor?