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Codex

Codex

OpenAI's AI Coding Agent for Developers

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Last Updated:8/3/2026
Pricing:
FreemiumSubscriptionCustom
Tool Type:
Web AppmacOS AppWindows AppAPIOpen SourceCLI Tool
Category:
AI DeveloperCommand-Line AI Coding
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Codex Updates
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OpenAI's Codex Can Now Plan, Design, and Message Teams Across Multiple Apps
NEW

OpenAI's Codex Can Now Plan, Design, and Message Teams Across Multiple Apps

Mar 27, 2026

What is Codex

Codex is an AI coding agent from OpenAI that can plan, write, test, and fix code with real autonomy. You describe a task in plain language, and Codex works through your project step by step, running commands, checking tests, and preparing changes for you to review.

It started as a tool for software engineers but has grown into a wider work assistant used by analysts, designers, and other non-technical teams too. Codex runs in isolated spaces, so it does not touch your main project files directly.

You can use it from a desktop app, a command line tool, inside your code editor, or through ChatGPT on the web, and everything stays in sync across each place you work.

Features of Codex

  • AI agent for coding, testing, and reviewing

  • Multi-agent parallel task execution

  • Isolated sandboxes for safe changes

  • Reusable skills for repeat workflows

  • Role-based plugins for teams

  • Background automations for recurring tasks

  • Desktop, CLI, IDE, and web access

  • Synced work across your ChatGPT account

  • Approval gates and permission controls

  • Used by developers and knowledge workers

Codex Pricing

Free
Free
  • Limited access to GPT-5.5 Instant
  • Limited messages and uploads
  • Limited Codex access
  • Limited ChatGPT Work access on desktop
Go
$8/mo
  • More access to GPT-5.5 Instant
  • More messages and uploads
  • More image creation
  • Longer memory
Most Popular
Plus
$20/mo
  • Advanced reasoning with GPT-5.6
  • Expanded Codex usage
  • Projects, scheduled tasks, and custom GPTs
  • Expanded deep research and memory
Pro
$100/mo
  • 5x or 20x more usage
  • Maximum Codex tasks
  • Pro reasoning with GPT-5.6 Sol Pro
  • Unlimited image creation and deep research
Business
$20
  • Codex, ChatGPT, and ChatGPT Work on all devices
  • Connect Microsoft 365, Google Drive, Slack, GitHub, Linear, and Figma
  • Centralized billing and administration
  • Secure workspace with SAML SSO and MFA
Enterprise
Custom
  • Expanded context window for large files
  • Enterprise-grade security with SCIM and Enterprise Key Management
  • Custom data retention and regional data residency
  • 24/7 priority support with SLA

Codex Use Cases

FAQ's About Codex

Yes, Codex offers limited access on the Free ChatGPT plan. Paid plans like Plus ($20/month) and Pro (from $100/month) give more Codex tasks and features.
Codex can plan, write, test, and fix code on its own. It can also prepare pull requests, run commands, and handle non-coding tasks like reports and documents.
You can use Codex through the desktop app, a command line tool, code editor extensions, or ChatGPT on the web.
Yes, Codex runs in isolated sandboxes or separate project copies, so it does not directly change your main files without your review.
Yes, through skills and plugins, Codex now supports analysts, designers, marketers, and other knowledge workers, not just software engineers.
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