Codex in the Cloud: Persistent Cloud Runner for OpenAI Codex
Murmell runs OpenAI Codex inside an isolated cloud sandbox rather than on your local machine. You connect your own OpenAI credentials, launch Codex in a browser terminal, and let it work in parallel with other agents without local setup or file overwrite risks.
Zero local configuration
Running OpenAI Codex locally requires installing CLI tools, managing Node.js runtimes, configuring environment variables, and consuming your machine's CPU and memory. On Murmell, every Codex session launches in a pre-configured cloud sandbox in seconds. You sign in with your OpenAI credentials and start issuing tasks directly from your browser.
Persistent cloud runtime
Local agent sessions die when you close your laptop lid or disconnect your network. Murmell keeps Codex running in an independent cloud container. You can trigger a multi-file refactor or test cycle, leave your workstation, and reconnect from any device to inspect the finished commit and terminal output. Read our guide on running several AI agents on one project.
File locking and conflict prevention with The Board
Running multiple AI agents on the same codebase usually causes race conditions and broken builds. Murmell introduces The Board, a live coordination ledger. Before Codex writes to any file path, it claims that path. Other agents running concurrently, such as Claude Code in the cloud, see the locked status and work on independent modules without collisions. Read how multiple AI agents share one repo without branches.
Concurrent execution on the multi-agent canvas
On the multi-agent canvas, you can run Codex alongside other CLI agents in separate windows. Codex can write new feature code while another agent inspects and documents existing endpoints. Compare this approach with running Codex alone in our Murmell vs local Codex comparison.
Full terminal fidelity and multiplayer canvas
Codex runs in a genuine terminal with complete PTY support, ANSI colors, and interactive prompts. You can inspect command history, view file diffs, and invite teammates to watch the session live with shared cursors. Learn how multiplayer coding with AI agents keeps teams synchronized.
Straight answers
How does running Codex in the cloud work on Murmell?
Murmell spawns a dedicated cloud runtime with a real Linux terminal for Codex. It clones your project repository into the workspace, connects to your OpenAI account or API key, and executes agent commands remotely.
Does Codex keep running if I close my browser tab?
Yes. The runtime lives on Murmell cloud infrastructure. Codex continues executing long-running test suites, refactors, and builds even when all browser tabs are closed.
How does Murmell prevent Codex from overwriting other agents?
Through The Board, a real-time reservation ledger. Codex reserves the file paths it intends to modify before writing. If another agent or developer holds the lock, Codex waits until the file is released.
Do I need to install Codex or Node.js locally?
No. Everything runs in the cloud sandbox. You only need a modern web browser to view, control, and inspect Codex sessions.