Codex vs Claude Code (October 2026): Which AI Coding Agent Fits Your Plan and Workflow?

Quick answer: Codex (OpenAI) and Claude Code (Anthropic) are both agentic coding tools that read your repo, edit files and run commands from the terminal, IDE, a desktop app or the cloud. The main difference in how you get them is the subscription: Codex comes with ChatGPT Plus, Pro, Business and Enterprise, while Claude Code comes with Claude Pro, Max, Team and Enterprise. Neither is on its vendor’s main free tier (OpenAI gives Free and Go limited desktop-app access). Both can bill per token with an API key instead. Prices: Codex pricing and claude.com/pricing (accessed October 25, 2026).

How do Codex and Claude Code compare?

	Codex (OpenAI)	Claude Code (Anthropic)
Included in	ChatGPT Plus, Pro (3 tiers), Business, Enterprise/Edu	Claude Pro, Max 5x, Max 20x, Team, Enterprise
Free tier	Free and Go: GPT-6 Luna in the desktop app only, subject to rollout	Not on Claude Free
Pay per token	OpenAI API key (CLI, SDK, IDE; no cloud features)	Anthropic Console account; also Amazon Bedrock, Google Cloud and Microsoft Foundry
Surfaces	CLI, IDE extension, desktop app, web (Codex cloud), iOS	CLI, VS Code and Cursor extension, JetBrains plugin, desktop app, web (claude.ai/code), iOS and Android
Install (macOS/Linux)	curl -fsSL https://chatgpt.com/codex/install.sh | sh	curl -fsSL https://claude.ai/install.sh | bash
Other installs	npm, Homebrew, PowerShell	Homebrew, WinGet, PowerShell, CMD, apt/dnf/apk
Scripting / CI	codex exec	claude -p, GitHub Actions, GitLab CI/CD
Project instructions	Skills and plugins	CLAUDE.md (or AGENTS.md), skills, hooks, auto memory
Tools	MCP (codex mcp), web search (--search), image input	MCP, Agent SDK
Parallel work	Subagents, Codex cloud tasks	Subagents, background agents, web sessions
Usage limits	Five-hour message ranges on Plus and Business; weekly limits may apply; Pro currently has no five-hour limit	Shared with Claude chat; rolling five-hour and weekly windows

Which one should you pick?

• You already pay for ChatGPT Plus or Pro: start with Codex. It’s included, and usage is shared with ChatGPT Work.
• You already pay for Claude Pro or Max: start with Claude Code. Usage is shared with your Claude chat allowance.
• You want a hard spend cap or run it in CI: either tool on an API key. Codex via codex login --with-api-key, Claude Code via a Console workspace with spend limits.
• Your team is on JetBrains IDEs: Claude Code has an official JetBrains plugin. Codex’s docs list an IDE extension; check its supported editors.
• You need cloud tasks on repos you don’t have locally: both offer it. Codex cloud needs ChatGPT sign-in; Claude Code on the web runs at claude.ai/code.

How do you get started with each?

Codex: install, run codex in a project, choose Sign in with ChatGPT. Full steps are in our Codex CLI guide.

Claude Code: run curl -fsSL https://claude.ai/install.sh | bash (or irm https://claude.ai/install.ps1 | iex in Windows PowerShell), check claude --version, then cd your-project and run claude. It prompts you to log in on first use. If ANTHROPIC_API_KEY is set and you approve it, it uses the key instead. Plan details are in Claude Code pricing and Claude Pro vs Max vs API.

Can you use both?

Yes. Nothing stops you from installing both and picking by task or by which allowance has room left. To avoid duplicating setup, keep shared rules in an AGENTS.md file: Anthropic’s docs say Claude Code can read it in place of CLAUDE.md. Also compare the chat apps behind them in Claude vs ChatGPT.