Comparison
Codex vs Claude Code
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.
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
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
Side-by-side comparison
| Category | Codex | Claude Code |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Model family | GPT / Codex | Claude (Opus, Sonnet, Haiku) |
| Context window | Up to 200k | Up to 1M |
| Surface | CLI + cloud execution | CLI |
| Hooks | Limited | First-class |
| Skills | No | Yes |
| Subagents | Limited | First-class |
| MCP servers | Yes | Yes |
| Best for | OpenAI-aligned teams | Maximum customization |
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.