Codex
OpenAI’s cloud and CLI coding agent.
Delegates software tasks to agents that run in sandboxes, with a local CLI and IDE integration.
- Vendor
- OpenAI
- Category
- Coding assistants
- Pricing
- Paid
- Open source
- No
- Platforms
- CLI, Web, IDE
- Launched
- 2025
- Website
- openai.com/codex
Features
- Parallel cloud tasks
- Open-source CLI
- PR generation
Best for
- Coding
- Agents
Works with
- GPT-6 Astra — OpenAI. OpenAI’s flagship for deep research, science and end-to-end engineering.
- GPT-6.1 Sol — OpenAI. Mid-tier GPT-6 model with excellent cost per task for agentic coding.
More coding assistants
- Claude Code — Anthropic. Agentic coding in your terminal, IDE and browser.
- GitHub Copilot — GitHub (Microsoft). The most widely deployed AI pair programmer.
- Cursor — Anysphere. The AI-native code editor.
- Cline — Cline. Open-source autonomous coding agent for VS Code.
- Windsurf — Cognition. Agentic IDE with the Cascade agent.
- Lovable — Lovable. Build apps by chatting with AI.
- v0 — Vercel. Generate full-stack web apps from prompts.
- Gemini CLI — Google. Open-source terminal coding agent powered by Gemini.