JetBrains engineers are using Codex and not their Junie coding agent 😬
Internally, JetBrains teams are using:
- ChatGPT
- GPT‑5
- Codex
Externally, JetBrains customers can choose GPT‑5 in Junie, the company’s coding agent, and in AI Assistant (for chat assistance).
Reference: Inside JetBrains—the company reshaping how the world writes code