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OpenAI Codex

OpenAI's coding agent for the cloud, the terminal and your IDE

Codex is OpenAI's software engineering agent. Connected to a GitHub repository, it works on tasks in a cloud sandbox from ChatGPT and proposes pull requests. The open source Codex CLI runs locally in the terminal, and an IDE extension brings the same agent to VS Code-based editors. It can build features, fix bugs, answer questions about a codebase and review code. Access comes with paid ChatGPT plans or API billing.

Cost / License
PaidProprietary
Categories
AI Coding Assistants
Platforms
WebWindowsMacLinux
OpenAI Codex screenshot
OpenAI Codex alternativesVisit website
features
4
alternatives
8
platforms
4
Updated
Oct 12, 2026

Features

Our take

Pros

  • Cloud tasks run in a sandbox and come back as pull requests
  • Open source CLI for local work in the terminal
  • Same agent across the cloud, the terminal and the IDE

Cons

  • Requires a paid ChatGPT plan or API billing
  • Cloud tasks depend on connecting your GitHub repository
  • Changes still need careful review before merging

Editorial assessment by the Alternatives.tools team, based on what the product is known for. Not a user review.

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