Codex
OpenAI's coding agent. It works on tasks in parallel in the cloud or locally: pull requests, refactors, code reviews and automations.
Claude Code
Anthropic's agentic coding tool. It reads your codebase, edits files, runs commands and helps you ship faster from the terminal, IDE or desktop.
Compare:Claude Code vs CodexClaude Code vs CursorClaude Code vs Replit
What it is
Claude Code works where developers already work: in the terminal, in VS Code and JetBrains, and in a desktop app. You describe the change you want, and it plans the work, reads the relevant files, edits them and runs your tests.
It shines on multi-file changes, unfamiliar codebases and the chores nobody wants to do, like migrations and test coverage. You stay in control: it asks before risky actions, and every change lands as a diff you can review.
Similar tools
Cursor
An AI-first code editor. Fast autocomplete, an agent that edits across your project, and chat that understands your whole repository.
Replit
Build and deploy software in the browser with an AI agent, without spending a second on setup. Hosting and databases included.
GitHub Copilot
The AI pair programmer inside GitHub and your editor. Completions, chat, code review and a coding agent that opens pull requests.