AETHER Coder answering a question about a project's startup configuration, reading only the file it needed, then citing it. This session is running on gpt-5.3-codex, picked by the developer from the models their organisation has approved for this agent.
In the editor
It reads your project, plans, and shows its work.
Describe a task or just ask a question. The agent opens the files it needs, works through the change, and tells you exactly what it touched, without leaving the editor.
Context and cost, live. The meter above every task shows how much of the model's context window is in play and what the session has cost so far.
Every file it reads is cited. Named, linked and line-scoped, so you can check the answer instead of trusting it.
Plan first, then Act. Think a change through before a line moves, and set auto-approve rules for the steps you'd always say yes to.