Codex

OpenAI’s coding agent. Wraps OpenAI’s frontier models in a harness optimized for software development tasks — reading codebases, writing code, executing tests, and iterating.

What It Is

Similar category to Claude Code (Anthropic) and Cursor, but from OpenAI. Takes raw model intelligence and wraps it with tools for file access, code execution, and test running.

In Multi-Agent Setups

Codex appears alongside Claude as an agent in Paperclip multi-agent configurations — e.g., a CTO role using Claude and an engineer role using Codex on the same project.

Also Referenced As

The GStack documentation references Codex as one of the coding agents it works on top of (alongside Claude Code).

See Also

• Claude Code — Anthropic’s equivalent
• Cursor — editor-first coding agent alternative
• Devin — autonomous software engineering agent
• Paperclip — multi-agent orchestration that combines Codex and Claude
• GStack — Claude Code / Codex skill set
• Matthew Berman — source
• Source: Every AI Model Explained