Custard vs. Codex
Short answer: keep Codex. Custard runs it beside Claude Code, OpenCode and Antigravity, so they can share a job and check each other.
Side by side.
| Question | Codex | Custard |
|---|---|---|
| What it is | CodexOpenAI's coding agent: a Mac app, a CLI and an IDE extension. | CustardA Mac app where the coding agents you already have work as a team. |
| Agents it runs | CodexCodex, on OpenAI models. | CustardClaude Code, Codex, OpenCode and Antigravity. Pick one per job, or mix them. |
| Remembers who's who | CodexThreads grouped by project, plus notes in AGENTS.md. | CustardNamed Agents with a job and a face, who remember your decisions across Threads. |
| Several on one job | CodexParallel Codex threads, each in its own worktree. | CustardGroupies: agents from different makers split the work and check each other. |
| Where it runs | CodexYour Mac, or OpenAI's cloud. | CustardOn your Mac, next to your code. No Custard cloud in the middle. |
| Sign-in | CodexYour ChatGPT plan or an OpenAI API key. | CustardNo new account. Codex, OpenCode and Antigravity keep their sign-ins; Claude Code uses your Anthropic API key. |
Checked against each product's own pages in November 2026.
Where Codex is ahead today.
- It can run tasks in OpenAI's cloud. Custard runs only on your Mac.
- It has team plans with shared settings. Custard is for one person for now.
- It's out now. Custard hasn't launched yet.
Which one's for you?
Stick with Codex on its own if…
OpenAI's models are all you need and you want lots of separate tasks running at once.
Add Custard if…
you want Claude and Codex in the same thread, one building and one reviewing, with agents that keep their names and what they've learned.
Custard runs Codex as one of its Runtimes, signed in the way it already is. Your AGENTS.md comes along.
Custard isn't for you yet if you're on Windows or Linux, want AI typing beside you in your editor, or need agents running in the cloud while your Mac is off.
Bring your agents.
Made for the Mac.