The developer tools landscape has been turned upside down. According to JetBrains Research's "Developer Ecosystem Survey 2026," which surveyed over 15,000 professional developers worldwide, Claude Code has overtaken GitHub Copilot to become the most-used AI coding agent in workplace settings—with a 39% usage rate compared to Copilot's 21%. This marks a seismic shift in how developers are approaching AI-assisted programming.

How Claude Code Pulled Off the Upset

Just 18 months ago, the picture looked very different. Claude Code's workplace usage rate was only 3% in early 2025. By mid-2026, it had skyrocketed to 39%—a roughly 13-fold increase in a year and a half.

What makes this particularly striking is that awareness of the two tools is identical at 79%. Developers know about both options, but they're choosing Claude Code for actual work. As JetBrains Research noted, this suggests that "high awareness in the AI coding market does not necessarily translate into high workplace use".

From Autocomplete to Agent-Style AI

The shift reflects a broader change in how developers use AI. Rather than tools that simply autocomplete code, agent-style AI is moving toward participating in the overall flow of development work. Claude Code's rise is a clear signal that developers want more than just code completion—they want an AI that can reason, plan, and execute tasks as part of their workflow.

The Broader AI Coding Market

GitHub Copilot's Slow Slide

GitHub Copilot had held steady at around 29% to 31% usage for some time, but the latest survey shows it has fallen to 21%. Despite being the pioneer in this space and maintaining strong brand recognition, it's struggling to keep pace with newer, more agent-focused alternatives.

OpenAI Codex: The Rapid Riser

OpenAI's Codex is another story entirely. Only 27% of developers knew about Codex in January 2026, but that figure jumped to 65% by mid-2026. Its workplace usage rose from 0% in early 2025 to 16% —a meteoric rise that JetBrains Research assessed as "a tool that is spreading rapidly".

Open-Source and Emerging Contenders

The survey also found that open-source solutions like OpenCode and Google Antigravity have secured a certain level of awareness and adoption. JetBrains AI, which coordinates multiple agents, is also being used by some developers.

What This Means for Developers

The implications are clear. Nine out of ten professional developers use AI coding agents at least once a week, and 68% use them daily. These tools have become part of routine development work, not just auxiliary technology used for testing.

The competition going forward will likely center on how deeply a tool is embedded in actual development work, rather than which AI coding tool developers know. As agent-style software development advances further, developers can expect significant changes in their toolkits and practices.