OpenAI Codex review: parallel by design, one vendor
Last reviewed: September 2026
Verdict
Codex gives you parallel coding tasks everywhere you work: an open-source CLI, a desktop app built as a "command center," an IDE extension and cloud environments. It runs OpenAI models only and documents no handoff to other agents, so it ranks eighth (4.8/10). Codex is also listed among BAND's coding-agent integrations.
4.8/10
Best for: OpenAI-only parallel tasks across CLI, desktop app and cloud
- Agent-to-agent handoff (25%)
- 2.5
- Multi-vendor agents (20%)
- 0.0
- Local execution (15%)
- 8.5
- Shared visibility (15%)
- 6.5
- Human intervention (10%)
- 6.5
- Setup effort (8%)
- 8.5
- Price (7%)
- 8.0
- Multi-vendor agents: Single vendor: OpenAI models only, which the rubric scores 0.
What is OpenAI Codex?
OpenAI's coding agent comes in four forms: CLI, desktop app, IDE extension and web/cloud. The desktop app is described as a "command center for complex work" that lets you "run projects in parallel," and it runs on macOS, Windows and Linux per OpenAI's docs. The CLI is open source under Apache-2.0.
How does multi-agent work run in OpenAI Codex?
Parallel and isolated. Locally, Codex uses git worktrees. In the cloud, you "run coding tasks in parallel cloud environments." We found no documentation of Codex handing tasks to other agents or receiving them.
Run your agents as a team
BAND for desktop lets your coding agents hand work to each other in shared rooms while you stay in the loop. Claude Code joins via BAND's plugin; Codex, GitHub Copilot and OpenCode are listed as integrations. Sessions stay on your machine (macOS or Linux).
What works in OpenAI Codex, and what to watch out for?
What works
- Available on every surface, including a desktop app on all three major operating systems.
- Open-source CLI you can inspect and script.
- Low entry cost: Free and Go tiers exist, and Plus is $20/month.
- Works well as one member of a mixed team; see how to run Claude Code and Codex together.
Watch-outs
- OpenAI models only.
- No documented agent-to-agent handoff.
- Some users report high memory use in the desktop app.
How much does OpenAI Codex cost?
| Plan | Price |
|---|---|
| Free | $0 |
| Go | $8/mo |
| Plus | $20/mo |
| Pro | From $100/mo (5x or 20x more Codex usage than Plus) |
| Business | $20/user/mo annual or $25 monthly |
| Enterprise, Edu | Custom |
| API key | Usage-based |
What are the key facts about OpenAI Codex?
| Item | Detail |
|---|---|
| Vendor | OpenAI |
| Execution | Local worktrees and cloud environments |
| Agents | OpenAI models only |
| Coordination | None between agents |
| Open source | CLI (Apache-2.0) |
| Entry price | Free; Plus $20/mo |
Who should use OpenAI Codex?
OpenAI users who want parallel tasks across CLI, app and cloud.
Who should look elsewhere
Teams that need Codex to pass work to Claude Code or Copilot; that needs a coordination layer such as BAND for desktop.
How does OpenAI Codex compare?
Questions about OpenAI Codex
Is Codex open source?
The Codex CLI is open source under Apache-2.0. The desktop app and cloud service are separate products.
Can Codex work with Claude Code?
Not natively. You can run both side by side or connect them through a coordination layer.
Does Codex run locally?
Yes, through the CLI, IDE extension and desktop app, using git worktrees for parallel tasks. Codex cloud runs tasks in cloud environments.