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