A sandbox for OpenAI Codex

Full Linux VM with Docker, git, and 200+ tools. Persistent sessions. No timeouts. From $6/mo.

Start in 60 seconds See pricing

Why Codex needs a dedicated environment

Codex writes code, installs packages, runs builds, starts services. It needs a real machine.

Real isolation

KVM virtual machine with its own kernel. Not a container. Codex can install packages, run Docker, modify system configs without restrictions.

No timeouts

Sessions persist indefinitely. Let Codex work overnight. Come back to finished results. No idle disconnects, no hour limits.

Full toolchain

Every major language runtime, Docker, databases, build tools. Pre-installed from a memory snapshot so nothing counts against your disk.

How it works

1.

Sign up and get a shell

Create an account. Your VM boots from a memory snapshot in seconds. 200+ tools are ready to go.

2.

SSH in or open the web terminal

Standard SSH from any client. Or use the browser-based terminal with Mosh over WebTransport. Codex is pre-installed — set your API key and go. Setup guide

3.

Run Codex and let it work

Start Codex. Close your laptop. Sessions persist through disconnects, reboots, and network changes. Check back from any device.

What Codex gets

A managed Linux machine running Ubuntu 24.04. Docker and Compose work natively. PostgreSQL, Redis, nginx are pre-installed. Go, Rust, Python, Node, Ruby, Java, PHP, Zig, Bun, Deno. git, gh, ripgrep, jq, neovim, and about 190 more tools.

All of it is loaded into a memory snapshot, so nothing counts against your disk quota and the VM boots in seconds. Your home directory persists across restarts.

Each shell has a public IPv6 address and a dev preview URL. Start a web server on any port, share the link. Codex can stand up a full stack and you can see it running immediately.

Pricing

Flat rate. No metered billing. Cancel anytime.

starter

Shell

$6/mo

or $60/yr

2 GB RAM, 1 vCPU, 10 GB disk. 200+ tools pre-installed. Relay access included.

Get Started

Give Codex its own machine.

Sign up, SSH in, run Codex. Takes about a minute.

Get started