Codex vs JetBrains AI Assistant / Junie: Side-by-Side Comparison 2026
Codex vs JetBrains AI Assistant / Junie comparison for 2026. Features, pricing, AI capabilities, and editor support analyzed side by side to help you choose the right coding tool for your workflow.
Codex is an AI agent and a CLI-based coding agent from OpenAI — asynchronous autonomous coding agent. JetBrains AI Assistant / Junie is an editor extension from JetBrains — native ai assistant for jetbrains ides.
Codex🏆 Approved
OpenAI's autonomous coding agent. Available via web, desktop app (macOS), CLI (macOS/Linux/Windows), and VS Code extension.
- ✓ Code completions
- ✓ AI chat
- ✓ Agentic mode
- ✓ Multi-file editing
- ✓ Terminal commands
Free / $8/mo · 6 plans
JetBrains AI Assistant / Junie
AI assistant and Junie agent built into every JetBrains IDE (IntelliJ, PyCharm, WebStorm, etc.). Free tier ships with 3 credits. Pro $10/mo, Ultimate $30/mo, Enterprise $60/mo.
- ✓ Code completions
- ✓ AI chat
- ✓ Junie (autonomous agent)
- ✓ Multi-file editing
- ✓ Terminal commands
Free / $10/mo · 5 plans
| Feature | Codex | JetBrains AI Assistant / Junie |
|---|---|---|
| Category | Agent / CLI | Extension |
| Starting Price | Free | Free |
| Model Family | GPT / Codex | Multi-model |
| Open Source | Yes (CLI) | No |
Pricing verified May 4, 2026. Codex pricing | JetBrains AI Assistant / Junie pricing
Key Differences
- Category: Codex is an AI agent and a CLI-based coding agent; JetBrains AI Assistant / Junie is an editor extension.
- Starting price: Codex starts at $8/mo; JetBrains AI Assistant / Junie starts at $10/mo.
- Model family: Codex uses GPT / Codex; JetBrains AI Assistant / Junie uses Multi-model.
- Open source: Codex: Yes (CLI). JetBrains AI Assistant / Junie: No.
- Platforms: Codex runs on Linux, Web, Windows (experimental), macOS; JetBrains AI Assistant / Junie runs on Linux, Windows, macOS.
- Provider: Codex is built by OpenAI; JetBrains AI Assistant / Junie is built by JetBrains.
Which Should You Choose?
Choose Codex if you want asynchronous coding tasks you can fire off and review when ready. Choose JetBrains AI Assistant / Junie if you want native AI assistance with multi-model choice and agentic capabilities. Read our full reviews to see which fits your workflow.