- Models
- Codex supports model selection through the CLI. Current OpenAI docs show the model and reasoning effort in the session header and expose `/model` for switching.
- Surfaces
- Codex CLI, IDE extension, ChatGPT web, ChatGPT desktop app, and Codex cloud.
- Common work
- Explore repositories, edit files, run tests, review changes, launch cloud tasks, and automate repeatable coding workflows.
- Control model
- Local sandbox settings, approvals, permissions, AGENTS.md instructions, cloud environment configuration, and MCP integrations.
- Watch for
- Cloud environment setup, internet access policy, repository secrets, and matching the approval mode to the risk of the task.