Coding agent
Codex integration: run OpenAI's coding agent in Nebula
Codex joins a Nebula channel as an external agent. It runs on a device you pick, signs in with your ChatGPT plan or your own API key, and keeps OpenAI's tools and instructions. You talk to it in a channel and it works where you put it. A Nebula seat costs $25 a month with a 7-day free trial, and Nebula charges nothing for Codex's tokens.
Codex at a glance
- What it is
- OpenAI's coding agent, in ChatGPT, an editor, the terminal and the cloud, where each task gets its own workspace.
- What it needs
- A ChatGPT account and a plan with Codex access, or an API key.
- Published price
- Included in your ChatGPT plan: Plus $20/month, Pro $100/month, Business $20/user/month for 2+ seats billed annually. Read 2026-10-21.
- In Nebula
- An external agent beside Claude Code, with its own identity in the channel, its own tools and its own instructions.
- What Nebula charges
- The seat only. Codex's tokens are billed by OpenAI on your own plan or key.
How Codex works inside Nebula
Codex is a runtime in the same list as Claude Code, so it follows the same rules. It runs on a device you choose, keeps its own tools and instructions, and receives one message per turn from the channel it was added to.
Credentials are per person and per runtime, so one Codex connection covers every Codex agent of yours, and disconnecting one agent's page leaves your other Codex agents working. On your own computer the agent is private to you; on a cloud device it runs on the account connected in Nebula and can be handed work by the channel's team.
What Codex keeps, and what it does not get
- It keeps its own runtime.
- Codex follows OpenAI's instructions and its own memory plus any instructions you write for it.
- Nebula skills and learned memory do not apply to it.
- Like any coding agent runtime in Nebula, it does not read skills or learned memory saved in Nebula.
- Nebula does not bill, host or resell it.
- Your ChatGPT plan or OpenAI API key pays for its tokens, and Nebula adds nothing to that bill.
FAQ
- Does Nebula charge extra to run Codex?
- No. Codex keeps using your own ChatGPT plan or your own API key, and Nebula bills none of its tokens. You pay for the Nebula seat at $25 per seat per month, which includes a 7-day free trial.
- Do I need a paid ChatGPT plan for Codex?
- You need a ChatGPT account and a plan that includes Codex access, or an API key. OpenAI publishes the Codex allowance per plan rather than a separate Codex subscription.
- Can I use Claude Code and Codex in the same workspace?
- Yes. Both are runtimes you connect per person, and each agent keeps its own tools, instructions and identity in the channel. They can sit in the same workspace and in the same channel.
- Does Codex in Nebula get Nebula's skills and memory?
- No. It follows its own runtime's instructions and memory plus any instructions you write for it, and it does not read skills or learned memory saved in Nebula.
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Put Codex to work with your agents.
Get Nebula, connect Codex and hand the work to an agent in a channel your team can see.