Codex

OpenAI's cloud + CLI coding agent, reborn as an autonomous engineering assistant

0Code & DevelopmentFreemium

Editorial Review

OpenAI's 2025 Codex relaunch is a different product from its 2021 namesake. Where the original was a code-completion model, the new Codex is an agent — it can run cloud tasks for hours, draft full PRs from a single prompt, and operate locally via CLI for terminal-resident workflows. The cloud variant sandboxes environments and parallelizes tasks well, making it strong for long-horizon refactors and feature delivery. Bundled access via ChatGPT Plus ($20/mo) is the easiest entry point and a credible alternative to a dedicated coding-tool subscription if you already pay for ChatGPT. For heavy use, Pro ($200/mo) and Team/Enterprise plans unlock higher limits and concurrent task budgets. Compared to Claude Code, Codex's cloud-agent path is the differentiator — long-running autonomous tasks "just run" without your laptop staying open.

Key Features

Cloud-based agent at chatgpt.com/codexLocal Codex CLI for terminal useIDE extension (VS Code and others)

About Codex

Codex is OpenAI's relaunched coding agent (2025), distinct from the original 2021-2023 Codex model. It runs as a cloud-based agent (via chatgpt.com/codex), a local CLI, and an IDE extension, handling tasks from quick edits to long-horizon multi-step engineering work. Bundled with ChatGPT Plus/Pro/Team/Enterprise plans, plus available via API.

Pricing

ModelFreemium

Starts at$20/mo

Best For

Solo

Small (2-10)

Medium (11-50)

Mid-Market (51-200)

Enterprise (200+)

Integrations

VS CodeGitHubChatGPTOpenAI API

See Codex compared

Claude Code vs Codex vs Aider