Codex, Cursor, or Claude Code: A Practical Guide to AI Coding Assistants

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The AI-assisted development space is now dominated by three distinct tools: OpenAI's Codex, Cursor, and Anthropic's Claude Code, each built around a different workflow paradigm. Codex, originally a GPT-3 derivative trained on public GitHub code, pioneered inline autocomplete and remains the foundation of tools like GitHub Copilot, though its standalone API has since been deprecated. Cursor is a full VS Code fork engineered for deep codebase integration, offering repository-wide indexing, multi-file editing via its Composer feature, and support for multiple AI models including GPT-4o and Claude 3.5 Sonnet. Claude Code, powered by Anthropic's Claude 3.5 Sonnet, takes an agentic CLI-based approach, bringing AI assistance directly into the terminal. Choosing between them depends on a developer's workflow needs — inline speed, visual multi-file editing, or terminal-based agentic control.

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