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Question

Codex CLI, IDE extension or cloud: which should I use?

Verified Oct 17, 2026 Review by Jan 15, 2027 3 sources
Short answer

Use the IDE extension for edits while you work in your editor, the CLI for terminal-first or scripted work, and Codex cloud for long or parallel tasks you want to hand off. Local surfaces can reach your local services and MCP servers; Codex Cloud tasks run in isolated workspaces built from a cloud environment you set up.

What it is

Codex comes in several surfaces that share one agent. The choice is about where the work runs and what it can reach.

How it works

  • IDE extension: the agent works next to your open files. Best for interactive changes you watch and steer.
  • CLI: the agent runs in your terminal. Best for terminal-first developers, scripted runs and quick fixes.
  • ChatGPT desktop app: shares the same MCP configuration as the CLI and IDE extension.
  • Codex Cloud: each task gets its own isolated workspace built from a cloud environment you set up (repositories, dependencies, tools and access settings), so several can run in parallel and keep going while your computer sleeps. Internet access is off during the agent phase unless you enable it for the environment.

A simple rule: if the task needs your local database, local services or a local MCP server, keep it local. If it’s well specified and self-contained (tests, refactors, docs), send it to the cloud.

Benefits

  • One agent, several ways to run it, so you can match the surface to the task.
  • Cloud tasks free your machine and run in parallel.
  • Shared MCP configuration means one setup for local surfaces.

Limits and risks

  • OpenAI documents the shared MCP configuration for the desktop app, CLI and IDE extension only; plan on configuring Codex Cloud’s access separately.
  • Parallel tasks can conflict; review and merge one at a time.
  • Usage limits differ by plan: OpenAI’s pricing page lists Codex as limited on Free and Go, included on Plus and expanded on Pro (checked 2026-10-17).

Checked specs

Snapshot from official sources on Oct 17, 2026.

Shared MCP config (checked 2026-10-17)ChatGPT desktop app, CLI and IDE extension share MCP configuration for the same Codex host (~/.codex/config.toml) [2]
Codex CloudTasks run in isolated workspaces from a prepared cloud environment; internet access off during the agent phase unless enabled; continue while your computer sleeps [1]
Plan accessCodex limited on Free and Go, included on Plus, expanded on Pro [3]

Best-fit stacks

Stack 08

Dev, web & IT

Design, code, host and ship sites and internal tools, with an AI editor doing most of the typing.

Agent compatibility

Tool in this entryHow agents connect
OpenAI Codex Agent platform API/CLI

Levels come from each tool's recorded, sourced compatibility. How the levels work.

Sources

  1. Codex manual · OpenAIofficial accessed Oct 17, 2026
  2. Model Context Protocol (ChatGPT Learn) · OpenAIofficial accessed Oct 17, 2026
  3. ChatGPT plans and pricing · OpenAIofficial accessed Oct 17, 2026

Practitioner views are restated in our words and labeled as views, not measured results. Product facts come from official sources dated above.

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