Product

Codex

by OpenAI · Agentic Coding Assistant

What it does

An agentic software engineering platform that accepts natural-language task descriptions and autonomously writes, reviews, debugs, and refactors code across repositories, operating as a command-line interface (CLI) tool and inside the ChatGPT desktop app.

Key features

  • Multi-repository project support
  • GitHub pull request review in sidebar
  • Inline code and Markdown editing
  • Shell tool access for long-horizon agentic tasks
  • Powered by GPT-5.x Codex-optimized model variants
  • Secure MCP Tunnel for enterprise environments

Integrations

GitHubCursorReplitChatGPT desktop app (macOS and Windows)MCP servers