Comparison
Claude Code vs Codex
OpenAI Codex (the new autonomous coding agent, not the deprecated 2021 model) and Anthropic's Claude Code are both terminal-first coding agents. They differ on model family, ergonomics, and ecosystem.
Claude Code
Claude Code is Anthropic's terminal agent with rich hooks, skills, and subagent support. Best for highly customizable agentic workflows.
Choose Claude Code if
- You prefer Anthropic's Claude family for code
- You want extensive customization (hooks, skills, MCP)
- You want a 1M-token context window for monorepo work
- You want the most mature agent ecosystem
Codex
OpenAI Codex is a CLI/cloud agent for autonomous coding tasks. Best when you're already deep in the OpenAI ecosystem.
Choose Codex if
- You're using OpenAI for everything else
- You want the OpenAI cloud-execution model
- You prefer GPT-class models for code
Side-by-side comparison
| Category | Claude Code | Codex |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Model family | Claude (Opus, Sonnet, Haiku) | GPT / Codex |
| Context window | Up to 1M | Up to 200k |
| Surface | CLI | CLI + cloud execution |
| Hooks | First-class | Limited |
| Skills | Yes | No |
| Subagents | First-class | Limited |
| MCP servers | Yes | Yes |
| Best for | Maximum customization | OpenAI-aligned teams |
Whichever you pick, we audit the output.
Both agents will write code that ships fast and breaks subtly. We do code reviews and security audits on agent-built codebases — same approach regardless of model provider.
Frequently asked questions
- Is this the old OpenAI Codex (2021)?
- No. The 2021 Codex model was deprecated. The current Codex is OpenAI's autonomous coding agent, launched 2024–2025, that runs code in the cloud and ships PRs.
- Which is more expensive?
- Both can run hundreds of dollars per heavy session. Claude Code on Opus + 1M context is the most expensive; smaller-model usage on either is comparable. We help teams tune costs in our Claude Code Session ($150).
Already built something? We'll review it.
Code audit, security review, or full migration. Fixed quotes.