AI Coding
Codex
OpenAI's cloud-based coding agent
- Pricing
- Included with ChatGPT Pro ($200/mo)
- Website
- Visit →
- Updated
- Mar 2026
Codex is OpenAI’s answer to agentic coding. It runs in the cloud, takes a task description, and works through it autonomously — writing code, running tests, and iterating until the task is complete. Unlike ChatGPT’s inline code help, Codex operates on your actual repository through a sandboxed environment, making it a true coding agent rather than a code suggestion tool.
Key features
- Cloud-based autonomous code execution
- Works on your actual GitHub repositories
- Runs tests and iterates on failures automatically
- Sandboxed environment for safe execution
- Task-based interface — describe what you want, Codex builds it
Best for
- Developers who want to delegate complete coding tasks
- Bug fixes and test writing at scale
- Teams already invested in the OpenAI ecosystem
- Async development — start a task and come back to results
Limitations
- Cloud-only — cannot work on local projects directly
- Requires ChatGPT Pro subscription
- Newer product with less community tooling than alternatives