Codex
Codex is an AI coding agent by OpenAI.
OpenAI's coding agent for writing, reviewing and shipping code.
CodingFreemiumNew
openai.com
FreemiumPrice
CodingCategory
SeveralRuns on
YesFree tier
October 14Checked, with sources
What it does
Codex is OpenAI's software engineering agent. It can write features, fix bugs and review pull requests, working in the cloud, the CLI or your IDE.
- Parallel multi-agent workflows
- Cloud task environments
- Automatic PR review
- Codex CLI
- IDE extension
- Steering and queuing
- Cloud and local coding tasks
- Code review on pull requests
Best for
The maker
OpenAI
“AI Coding Partner from OpenAI”In their words
Pros & cons
Pros
- One assistant works across the app, cloud and editor.
Cons
- A subscription does not mean unlimited use; business pricing varies.
Pricing
FreemiumFree tier
Included with ChatGPT plans, with limits on Free
Prices change. Confirm on the official site.
Runs on
iOSAndroidMacWindowsLinuxWebCLIChromeWhatsAppTelegramSMSAPI
Lit = listed by the maker. Dimmed = not listed.
ChatGPT desktop app for Mac, Windows and Linux, plus cloud, coding-editor extension and command-line access, per the maker.
Sources
Last verified October 14, 2026
Compared with
- Codex vs Claude CodeSide by side, with a verdict
- Codex vs CursorSide by side, with a verdict
- Codex vs GitHub CopilotSide by side, with a verdict
- Codex vs Hermes AgentSide by side, with a verdict
- Codex vs OpenCodeSide by side, with a verdict
- Codex vs JulesSide by side, with a verdict
- Codex alternativesReal agents that do the same job
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