Codex in JetBrains IDEs

Why It Matters

Embedding Codex in JetBrains IDEs lets developers harness AI assistance without leaving their primary workspace, boosting productivity and accelerating code quality improvements across the software development lifecycle.

Key Takeaways

• Codex now integrates seamlessly directly into JetBrains IDEs
• Supports login via ChatGPT, API key, or JetBrains AI subscription
• Offers three access modes: read‑only, agent with approval, full access
• Demonstrated debugging, building, and localization tasks in Kotlin project
• Changes appear as uncommitted edits, ready for review and push

Summary

The announcement introduces Codex, OpenAI’s coding assistant, as a native feature inside JetBrains IDEs, allowing developers to interact with the model without leaving their preferred development environment. Users can authenticate using a ChatGPT account, an OpenAI API key, or a JetBrains AI subscription, and choose from three permission levels—read‑only, agent with user‑approved commands, or full access that permits unrestricted code changes.

During the demo, Gleb from JetBrains walks through a multi‑platform Kotlin conference app, showing Codex automatically scanning the project, diagnosing iOS build failures, and applying fixes. The assistant then generates a complete Spanish localization, executes Gradle commands, and validates the changes by rebuilding the app, all while displaying the modified files as uncommitted edits within the IDE’s version‑control view.

Key moments include Codex’s reasoning trace—highlighting which files it inspected—and its ability to run shell commands with user oversight. The model mirrors a developer’s workflow: first researching the codebase, then iteratively applying patches, and finally verifying functionality through the IDE’s native build tools. The sidebar interface lets developers continue their own tasks in parallel, closing the chat tab without interrupting work.

The integration promises to eliminate context‑switching, accelerate debugging and feature implementation, and broaden AI‑assisted development across JetBrains’ suite, from IntelliJ to PyCharm and Rider. By embedding Codex directly into the tools developers already use, OpenAI and JetBrains aim to set a new standard for productivity‑focused AI coding assistants.

Original Description

Codex now works in JetBrains IDEs.

In this quick tour with Gleb Melnikov from JetBrains, we use Codex on a real Kotlin multi-platform project to:

🐞 Debug a broken iOS build from a stack trace

🌍 Implement Spanish localization end-to-end

🔄 Stay in-flow inside the IDE while the agent researches, edits, and verifies changes

Sign in with your ChatGPT subscription, an API key, or your JetBrains AI subscription to collaborate with Codex directly in your JetBrains IDE.

Chapters:

00:00 Codex is now available in JetBrains

00:53 Sign in options + codebase tour

01:48 Fixing an iOS build error with Codex

04:11 Adding Spanish localization

05:08 Access modes

07:18 Working in parallel + self-verifying with builds

09:21 Works across JetBrains IDEs + wrap-up