In the realm of AI-driven computer automation, two prominent solutions have emerged recently: Claude Code and Codex. Both enable AI to take control of your computer, but they follow entirely different technical approaches. This article will break down their differences in terms of functionality, technical principles, and practical applications, and even show you how to use them together for maximum efficiency.
1. Hands-On Demonstration: How They Work in Action
Let’s start with a practical demo to see how each tool operates. Both Claude Code and Codex offer a feature called Computer Use, which can be accessed via terminal commands or desktop clients. Here’s a side-by-side test:
• Using Claude Code to Create a Calendar Event
Open your terminal and launch Claude Code.
Issue the command:
用 computer use 打开 macOS 日历，在周六创建一个全天事件，标题为“周六出去玩”Observe: Claude Code will take over your physical mouse, automatically open the Calendar app, navigate to Saturday, and create the event. You’ll see your mouse moving on its own—this is because Claude Code interacts with the screen visually, just like a human user.
• Using Codex to Create a Calendar Event
Open your terminal and launch Codex.
Issue the command:
用 Computer Use 打开 macOS 日历，在周日创建一个全天事件，标题为“周日出去玩”Observe: Codex uses a virtual cursor that works in the background. Your physical mouse remains under your control, and Codex silently completes the task in parallel.
2. Technical Principles: Vision vs. Structured Data
To understand their differences, let’s dive into how they “see” and interact with your computer.
• Claude Code: The “Visual Learner”
Claude Code operates like a human user who can only see the screen (not the underlying code). Its workflow is:
Screenshot: Capture the current screen.
Analyze: Send the screenshot to the AI model to identify UI elements (buttons, text fields, etc.).
Act: Move the physical mouse to click, type, or navigate.
Repeat: Cycle through screenshot → analyze → act for each step.
This approach is similar to Tesla’s full-self-driving (pure vision), where AI relies solely on camera inputs to make decisions.
• Codex: The “Data Parser”
Codex leverages macOS’s built-in Accessibility Tree (AX Tree), a system designed for visually impaired users to describe UI elements (buttons, menus, etc.) in structured data. Its workflow is:
Fetch Data: Retrieve structured information about the app’s UI (element names, positions, states).
Act: Send direct commands to the system to click or interact with elements, without needing to move a physical mouse.
Fallback: If AX Tree data is unavailable, it falls back to screenshot-based interaction (but this is rare).
This is analogous to LiDAR-based self-driving, where AI uses precise structural data to navigate.
3. Practical Comparison: Speed, Cost, Accuracy, and More
Let’s compare them across key metrics:
| Metric | Claude Code | Codex |
|---|---|---|
| Speed | Slower (due to screenshot analysis cycles) | Faster (direct structured data access) |
| Cost | More expensive (high token usage for screenshots) | Cheaper (≈1/4 token usage of Claude Code) |
| Accuracy | Prone to errors on high-resolution screens (pixel-level clicks) | Highly accurate (targets elements directly) |
| Multi-Tasking | Cannot multitask (shares one physical mouse) | Can multitask (multiple virtual cursors) |
| System Support | Cross-platform (Mac, Windows, remote desktops) | Only macOS (and restricted in some regions like Europe due to privacy laws) |
| App Compatibility | Works with any app (even non-standard UIs like games or Figma) | Relies on AX Tree (fails with apps lacking accessibility data) |
4. Practical Tips: When to Use Which Tool
Choose Codex if you:
Use macOS and need fast, accurate, and non-intrusive automation.
Want to run multiple tasks in the background while using your computer normally.
Prioritize cost-effectiveness for standard macOS apps.
Example Command for Codex (non-interactive mode):
codex exec --full-auto --ephemeral --skip-git-repo-check -o result.txt "使用 Computer Use 打开 macOS 计算器应用，输入 1+1，然后告诉我计算结果"Choose Claude Code if you:
Need to automate non-standard apps (e.g., games, custom tools) or work across multiple operating systems.
Prefer a more “human-like” interaction model and don’t mind sharing your mouse.
Want long-term scalability (its visual approach is more adaptable to future UI changes).
Example Command for Claude Code (terminal interaction):
用 computer use 打开 Windows 画图工具，绘制一个红色圆形
5. Pro Tip: Use Them Together
For the best of both worlds, have Claude Code act as the “commander” to invoke Codex’s capabilities. Here’s how:
Use Claude Code’s terminal to send commands to Codex’s non-interactive mode.
Example workflow: Ask Claude Code to run a Codex command to automate a macOS task, then have Claude Code process the result.
Example Command to Link Them: In Claude Code’s terminal, input:
运行 codex exec --full-auto --ephemeral --skip-git-repo-check -o result.txt "使用 Computer Use 打开 macOS 备忘录，创建一条内容为‘AI 自动化测试’的笔记"
Conclusion
Codex excels at fast, accurate, and silent automation on macOS, while Claude Code offers unmatched versatility and long-term potential. For most macOS users, Codex is the practical choice today, but Claude Code is worth watching for its cross-platform and adaptive capabilities. Experiment with both, and don’t forget you can combine them for even more powerful workflows!
Related reading: Codex Agent · OpenAI Codex and OpenClaw · Claude Code Installation · Claude Code Overseas Guide · Claude Code Top 7 Skills
常见问题
Q: Can I use Claude Code and Codex at the same time?
Yes, and it is actually a powerful combination. You can use Claude Code as the "commander" to invoke Codex's non-interactive mode for macOS-specific tasks. For example, Claude Code can send a command to Codex to create a calendar event, then process the result. This lets you leverage Claude Code's cross-platform versatility alongside Codex's fast, accurate macOS automation.
Q: Which tool is better for Windows users?
Claude Code is the better choice for Windows users because Codex relies on macOS's Accessibility Tree (AX Tree), which is only available on macOS. Claude Code's vision-based approach works on Windows, Mac, and even remote desktops, making it the only option for non-macOS platforms.
Q: Does Codex's virtual cursor really let me multitask?
Yes. Codex uses a virtual cursor that operates in the background, so your physical mouse remains under your control while Codex completes tasks in parallel. Claude Code, by contrast, takes over your physical mouse, preventing you from using your computer during automation tasks.