Claude Code vs Codex CLI

Claude Code (Anthropic) and Codex CLI (OpenAI) are both strong terminal-native coding agents with MCP support. Codex CLI is open source; Claude Code is proprietary but known for strong agentic reasoning. Many developers run both — which is exactly what a terminal like Agents UI makes easy.

At a glance

Feature	Claude Code	Codex CLI
Provider	Anthropic	OpenAI
Price	Included in Claude plans / API usage	Included in ChatGPT plans / API usage
Open source	No	Yes
License	Proprietary	Apache-2.0
Interface	CLI	CLI
Terminal-native	Yes	Yes
MCP support	Yes	Yes

When to choose Claude Code

You want Anthropic's models and strong agentic reasoning over large codebases.

Claude Code strengths

• Strong agentic reasoning over large codebases
• First-class MCP support
• Runs directly in the terminal

When to choose Codex CLI

You prefer an open-source agent on OpenAI's models, or you're already in the ChatGPT ecosystem.

Codex CLI strengths

• Open source and scriptable
• MCP support
• Terminal-native workflow

How Agents UI compares

If your work centers on AI coding agents, it's worth weighing a third option. Agents UI is an open-source macOS terminal built specifically to run agents like Claude Code, Codex, and Gemini CLI — with multi-agent orchestration, SSH, and a Python SDK in one workspace. Explore the best terminals for multi-agent workflows to see where it fits.

Frequently asked questions

Is Claude Code better than Codex CLI?

Claude Code (Anthropic) and Codex CLI (OpenAI) are both strong terminal-native coding agents with MCP support. Codex CLI is open source; Claude Code is proprietary but known for strong agentic reasoning. Many developers run both — which is exactly what a terminal like Agents UI makes easy.

When should I choose Claude Code?

You want Anthropic's models and strong agentic reasoning over large codebases.

When should I choose Codex CLI?

You prefer an open-source agent on OpenAI's models, or you're already in the ChatGPT ecosystem.