Codex vs JetBrains AI Assistant / Junie: Side-by-Side Comparison 2026
Codex vs JetBrains AI Assistant / Junie comparison 2026. Side-by-side features, pricing & capabilities.
| Feature | Codex | JetBrains AI Assistant / Junie |
|---|---|---|
| Category | Agent | Extension |
| Starting Price | Free | Free |
| Model Family | GPT / Codex | Multi-model |
| Context Window | 400K | Not disclosed |
| Code Completion | ✓ | ✓ |
| Chat | ✓ | ✓ |
| Inline Editing | ✓ | ✓ |
| Agentic Mode | ✓ | ✗ |
| Multi-File Editing | ✓ | ✓ |
| Terminal Commands | ✓ | ✓ |
| Browser Use | ✗ | ✗ |
| Test Generation | ✓ | ✓ |
| Debugging | ✓ | ✓ |
| Refactoring | ✓ | ✓ |
| Code Review | ✓ | ✓ |
| PR Review | ✓ | ✗ |
| Documentation | ✓ | ✓ |
| Image to Code | ✗ | ✗ |
| Voice Input | ✗ | ✗ |
| App Generation | ✓ | ✗ |
| Deployment | ✗ | ✗ |
| Git Integration | ✓ | ✓ |
| Supported IDEs | Codex App, VS Code, CLI | All JetBrains IDEs (IntelliJ, PyCharm, WebStorm, GoLand, CLion, etc.) |
| Open Source | Yes (CLI) | No |
Pricing verified 2026-02-05. Codex pricing | JetBrains AI Assistant / Junie pricing
Overview
Codex is ai agent from OpenAI. JetBrains AI Assistant / Junie is editor extension from JetBrains. Both tools are actively maintained as of 2026.
Codex: What You Get
Codex — AI Coding Agent from OpenAI. App / CLI / IDE.
- Code completions
- AI chat
- Agentic mode
- Multi-file editing
- Terminal commands
- Test generation
- Debugging
- Code review
- Git integration
- App generation
Pricing: Free / $8/mo. 6 plans available.
Models: GPT-5.3-Codex, Codex-mini-latest
JetBrains AI Assistant / Junie: What You Get
JetBrains AI Assistant / Junie — AI Code Assistant from JetBrains. IDE-Integrated AI.
- Code completions
- AI chat
- Multi-file editing
- Terminal commands
- Test generation
- Debugging
- Code review
- Git integration
Pricing: Free / $10/mo. 4 plans available.
Models: GPT models, Claude models, Google models (via partner integrations)
Key Differences
- Category: Codex is ai agent, JetBrains AI Assistant / Junie is editor extension.
- Agentic mode: Codex supports agentic mode; JetBrains AI Assistant / Junie does not.
- Model family: Codex uses GPT / Codex; JetBrains AI Assistant / Junie uses Multi-model.
Which Should You Choose?
Choose Codex if you want Codex handles multi-step tasks independently. Choose JetBrains AI Assistant / Junie if you want AI coding assistance in your existing editor. Both tools are strong options — the right choice depends on your workflow and priorities.
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