Claude Code
OpenAI CodexClaude Code vs OpenAI Codex: Which AI Coding Agent Should You Use?
Last updated 2026-05-30
Quick answer
Both are terminal first AI coding agents that also run in the cloud and can be steered from your phone. Claude Code wins on depth of configuration: a four tier CLAUDE.md, path scoped rules, 27 hook events, and dynamic workflows that orchestrate hundreds of background agents. Codex wins on breadth of product: one agent shared across CLI, desktop app, IDE extension, cloud, and the ChatGPT mobile app, with OS native sandboxing on by default and a free tier to start. Pick Claude Code if you want maximum control and treat your setup as versioned infrastructure. Pick Codex if you want a polished, secure, multi device experience out of the box.
Feature comparison
| Feature | Claude Code | OpenAI Codex |
|---|---|---|
| What it is | Anthropic's terminal first coding agent, plus desktop, web, and mobile surfaces | OpenAI's coding agent across CLI, desktop app, IDE extension, cloud, and ChatGPT mobile |
| Project config | CLAUDE.md, four tiers (managed, user, project, local) that concatenate, with @-imports and path scoped .claude/rules | AGENTS.md, two tiers (global and per directory) with a 32 KiB cap, plus config.toml |
| Hooks and automations | 27 hook events, five hook types (shell, HTTP, MCP, prompt, sub agent). Plus /loop and cloud routines for scheduling | Lifecycle hooks, plus a desktop Automations layer that runs scheduled agent jobs on a cron |
| Safety and sandbox | Permission modes with a background safety classifier. No OS level sandbox by default | OS native sandbox on by default (Seatbelt, bubblewrap, Windows Sandbox) |
| MCP support | MCP client and server, plus managed enterprise allowlists and one click desktop extensions | MCP client and server, OAuth login, shared config across CLI and IDE |
| Parallel agents | Custom sub agents as markdown files, plus dynamic workflows up to 1,000 agents per run | Parallel threads with git worktree isolation, plus parallel cloud tasks |
| Control from your phone | Remote Control mirrors a live session to your phone; Dispatch starts new tasks from mobile | ChatGPT mobile app drives a Codex session on your Mac, approve commands and review diffs |
| Runs with your laptop off | Yes. Cloud routines (/schedule) run on Anthropic infrastructure on a schedule, API, or GitHub event | Yes. Codex Cloud runs tasks in isolated cloud sandboxes, triggered manually or by tagging @codex |
| CI and headless | claude -p with --bare for deterministic runs, JSON output, an official GitHub Action, and the Agent SDK | codex exec for scripts and CI, JSON output, an official GitHub Action, and the Codex SDK |
| Models | Anthropic only: Opus 4.8 (default), Opus 4.7, Sonnet 4.6, Haiku. Five effort levels | OpenAI: GPT-5.5, GPT-5.4 and mini, GPT-5.3-Codex, plus any compatible provider |
| Pricing to use it | Pro $20/mo, Max $100 or $200/mo, or API pay per use. No free tier | Free tier, Go $8/mo, Plus $20/mo, Pro $100 or $200/mo. CLI is open source (Apache 2.0) |
| Standout strength | The deepest, fully versionable configuration layer (CLAUDE.md, rules, skills, agents) plus workflow orchestration | One agent and state shared across every surface, with strong security defaults and a free entry point |
What it is
Claude Code
Anthropic's terminal first coding agent, plus desktop, web, and mobile surfaces
OpenAI Codex
OpenAI's coding agent across CLI, desktop app, IDE extension, cloud, and ChatGPT mobile
Project config
Claude Code
CLAUDE.md, four tiers (managed, user, project, local) that concatenate, with @-imports and path scoped .claude/rules
OpenAI Codex
AGENTS.md, two tiers (global and per directory) with a 32 KiB cap, plus config.toml
Hooks and automations
Claude Code
27 hook events, five hook types (shell, HTTP, MCP, prompt, sub agent). Plus /loop and cloud routines for scheduling
OpenAI Codex
Lifecycle hooks, plus a desktop Automations layer that runs scheduled agent jobs on a cron
Safety and sandbox
Claude Code
Permission modes with a background safety classifier. No OS level sandbox by default
OpenAI Codex
OS native sandbox on by default (Seatbelt, bubblewrap, Windows Sandbox)
MCP support
Claude Code
MCP client and server, plus managed enterprise allowlists and one click desktop extensions
OpenAI Codex
MCP client and server, OAuth login, shared config across CLI and IDE
Parallel agents
Claude Code
Custom sub agents as markdown files, plus dynamic workflows up to 1,000 agents per run
OpenAI Codex
Parallel threads with git worktree isolation, plus parallel cloud tasks
Control from your phone
Claude Code
Remote Control mirrors a live session to your phone; Dispatch starts new tasks from mobile
OpenAI Codex
ChatGPT mobile app drives a Codex session on your Mac, approve commands and review diffs
Runs with your laptop off
Claude Code
Yes. Cloud routines (/schedule) run on Anthropic infrastructure on a schedule, API, or GitHub event
OpenAI Codex
Yes. Codex Cloud runs tasks in isolated cloud sandboxes, triggered manually or by tagging @codex
CI and headless
Claude Code
claude -p with --bare for deterministic runs, JSON output, an official GitHub Action, and the Agent SDK
OpenAI Codex
codex exec for scripts and CI, JSON output, an official GitHub Action, and the Codex SDK
Models
Claude Code
Anthropic only: Opus 4.8 (default), Opus 4.7, Sonnet 4.6, Haiku. Five effort levels
OpenAI Codex
OpenAI: GPT-5.5, GPT-5.4 and mini, GPT-5.3-Codex, plus any compatible provider
Pricing to use it
Claude Code
Pro $20/mo, Max $100 or $200/mo, or API pay per use. No free tier
OpenAI Codex
Free tier, Go $8/mo, Plus $20/mo, Pro $100 or $200/mo. CLI is open source (Apache 2.0)
Standout strength
Claude Code
The deepest, fully versionable configuration layer (CLAUDE.md, rules, skills, agents) plus workflow orchestration
OpenAI Codex
One agent and state shared across every surface, with strong security defaults and a free entry point
Our verdicts
Best for deep control
Claude CodeIf you want to treat your AI setup as versioned infrastructure, Claude Code is unmatched: a four tier CLAUDE.md, path scoped rules, 27 hook events, custom sub agents, and dynamic workflows. Everything is plain markdown, so it is transparent and lives in git.
Best out of the box
OpenAI CodexCodex gives you one agent across CLI, desktop, IDE, cloud, and your phone, all sharing the same config and state. For a polished multi device experience with little setup, it is the smoother choice.
Best security defaults
OpenAI CodexCodex enforces OS native sandboxing by default (Seatbelt, bubblewrap, Windows Sandbox) and defaults its headless mode to read only. Claude Code relies on permission policies and a safety classifier rather than OS level isolation.
Best to start for free
OpenAI CodexCodex has a genuine free tier and an open source CLI, so you can try it without a subscription. Claude Code has no free tier; you need a Pro plan or API credits.
Best for large scale and verification
Claude CodeClaude Code's dynamic workflows orchestrate up to 1,000 background agents per run with results held outside the context window, which suits codebase wide audits, big migrations, and research that needs independent cross checking.