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HomeAI ToolsCodex
Codex logo

Codex

AI Coding Agent

Quick Summary

Codex is OpenAI’s agentic coding platform for understanding codebases, writing and reviewing code, running tests, fixing bugs, and coordinating software development across app, IDE, terminal, and cloud.

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Web App / SaaSmacOSWindowsLinuxiOSAndroid
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About Codex

Codex is OpenAI’s agentic software development platform built to help developers move from understanding a codebase to planning, implementation, testing, review, and delivery. It can work directly with repositories, local development environments, terminals, IDEs, and cloud-based tasks, allowing developers to delegate both focused coding jobs and longer multi-step engineering work.

Codex supports parallel agents, isolated worktrees, reusable Skills, automations, code review, testing, debugging, and repository-aware development. Teams can also connect tools such as GitHub, Slack, Figma, and other services through ChatGPT Plugins, while business and enterprise deployments add centralized administration, security controls, audit capabilities, and governed access.

Key Features & Capabilities

Agentic Software Development - Handles coding tasks from planning and implementation through testing and review.

Browser Extension
VS Code Extension
CLI / Terminal

Codebase Understanding - Explores repositories, traces application logic, and reasons across multiple files.

Parallel Agent Workflows - Runs multiple coding agents simultaneously across isolated tasks and projects.

Code Generation & Editing - Creates new functionality and modifies existing code directly within development environments.

Testing & Debugging - Runs tests, investigates failures, identifies root causes, and iterates on fixes.

Code Review - Reviews changes and highlights bugs, regressions, security concerns, and quality issues.

Skills - Allows teams to define reusable instructions, standards, and workflows that Codex can apply consistently.

Automations - Supports recurring tasks such as issue triage, CI/CD monitoring, alerts, and repository maintenance.

IDE & CLI Support - Works through its IDE extension and command-line interface alongside the Codex desktop experience.

Plugin Integrations - Connects tools such as GitHub, Slack, Figma, and other services through ChatGPT Plugins.

Best Use Cases

01

Building new software features

02

Debugging application errors

03

Refactoring complex or legacy code

04

Performing large code migrations

05

Understanding unfamiliar codebases

06

Writing and maintaining automated tests

07

Reviewing pull requests and code changes

08

Identifying potential security regressions

09

Automating repository maintenance

10

Managing issue triage and CI/CD workflows

11

Running parallel development tasks

12

Creating prototypes and applications

13

Generating technical documentation

14

Automating repetitive engineering workflows

Target Audience & Ideal For

Software DevelopersProduct ManagersFounders & Indie HackersEnterprise & Corporate TeamsData Scientists & AI ResearchersAgencies & Freelancers

Pricing Plans & Tiers

Codex usage is bundled with ChatGPT plan allowances. Plus, Pro, and Business provide progressively higher Codex capacity, while credits can extend usage beyond included limits for eligible plans. Local and cloud Codex activity share the applicable plan allowance, and weekly limits may apply. Consumption varies depending on the model and complexity of the task.

Free

For individuals who want to explore Codex with limited access before moving to higher-usage coding plans.

For individuals who want to explore Codex with limited access before moving to higher-usage coding plans.
$0/ Monthly
  • Test Codex capabilities
  • Limited access to flagship GPT-5.6
  • Limited messages and uploads
  • Limited and slower image generation
  • Limited deep research
  • Limited memory and context

Go

For individuals who need more ChatGPT capacity than Free while retaining entry-level access to Codex.

For individuals who need more ChatGPT capacity than Free while retaining entry-level access to Codex.
$8/ Monthly
  • Test Codex capabilities
  • More access to flagship GPT-5.6
  • More messages
  • More uploads
  • More image creation
  • Longer memory

Plus

For developers who want expanded Codex usage and focused coding sessions across desktop, IDE, terminal, and connected development tools.

For developers who want expanded Codex usage and focused coding sessions across desktop, IDE, terminal, and connected development tools.
$20/ Monthly
  • Expanded Codex usage
  • Codex app for macOS and Windows
  • Connect Slack, GitHub, Figma, and more through Plugins
  • Advanced reasoning models
  • Expanded messages and uploads

Pro

For intensive individual users who rely on Codex for longer, higher-volume software development and advanced reasoning workflows.

For intensive individual users who rely on Codex for longer, higher-volume software development and advanced reasoning workflows.
$100/$200/ Monthly
  • Everything in Plus
  • Maximum Codex tasks
  • 5x or 20x more usage options
  • Pro reasoning powered by GPT-6
  • Unlimited GPT-5.6 and file uploads

Business

For teams that need Codex inside a secure shared workspace with collaboration, company context, administration, and business data protections.

For teams that need Codex inside a secure shared workspace with collaboration, company context, administration, and business data protections.
$25/user/ Monthly
  • Access ChatGPT, ChatGPT Work, and Codex
  • Web, desktop, and mobile access
  • AI for chat, coding, analysis, and workflows
  • Microsoft 365 integration
  • Google Drive integration

Enterprise

For organizations deploying Codex at scale with advanced governance, identity management, security, compliance, data controls, and flexible usage.

For organizations deploying Codex at scale with advanced governance, identity management, security, compliance, data controls, and flexible usage.
Custom Pricing/ Monthly
  • Everything in ChatGPT Enterprise
  • Codex for organization-wide development workflows
  • Pay-as-you-go or fixed seat-based pricing options
  • SCIM provisioning
  • Enterprise Key Management controls

Security & Compliance Certifications

SOC 2 Type II
ISO/IEC 27001
CSA STAR

Customer Support & Resources

Developer DocumentationCommunity Forum / Discord

Company & Organization Details

Company NameOpenAI
Founded Year2015
Company Size500+ employees
HeadquartersSan Francisco, California, United States
Social Channels
Access to the latest models
Expanded and faster image creation
  • Expanded deep research and agent mode
  • Expanded memory and context
  • Projects, tasks, and custom GPTs
  • Early access to new features
  • Unlimited and faster image creation
  • Maximum deep research and agent mode
  • Maximum memory and context
  • Expanded projects, tasks, and custom GPTs
  • Research preview of new features
  • Slack integration
  • GitHub integration
  • Linear and Figma integrations
  • Build on company knowledge and team context
  • Custom team agent plugins
  • Centralized billing and administration
  • Usage analytics, budgeting, and spend controls
  • SAML SSO and MFA
  • No training on business data by default
  • Domain verification
  • User analytics
  • Role-Based Access Control
  • Priority request processing
  • Audit logs
  • Compliance API
  • Usage monitoring
  • Data-residency controls
  • Custom data-retention controls
  • Enterprise-grade administration