Write, review, and ship production software faster than ever. Codex brings AI-powered code generation, intelligent debugging, and seamless CLI workflows to your entire development lifecycle.
Describe what you need in plain English — Codex generates production-ready code in 40+ languages.
Get instant, contextual feedback on every pull request. Codex catches bugs, suggests improvements, and enforces best practices.
The Codex CLI puts AI assistance directly in your terminal. Generate, lint, and deploy — all without leaving the command line.
Trusted by engineering teams worldwide
Describe your intent — Codex handles the syntax.
Modern software teams spend up to 40% of their time writing boilerplate, fixing syntax errors, and navigating unfamiliar APIs. Codex fundamentally changes that equation. You describe what the function should do, which edge cases to handle, and how it should fit into the existing codebase — and Codex produces the implementation. It understands context across files, respects your project's existing conventions, and generates code that passes review on the first attempt.
The platform draws on a deep understanding of programming languages, frameworks, and design patterns accumulated from analyzing millions of open-source repositories. Whether you are building a REST endpoint in Go, a React component in TypeScript, or a data pipeline in Python, Codex provides idiomatic solutions tuned to your stack. Developers report shipping features 3-5x faster after integrating Codex into their workflow.
Explore AI Code Generation →Every pull request gets a second set of eyes — that never tire.
Code review is the single biggest bottleneck in most engineering organizations. Senior developers spend 30-50% of their week reviewing code instead of building. Codex automates the first pass: it scans every pull request for logic errors, security vulnerabilities, performance regressions, and style violations — delivering a detailed report within seconds of the PR opening. Human reviewers focus on architecture decisions and nuanced trade-offs; Codex handles the mechanical checks.
The review engine understands semantic meaning, not just syntax. It can flag a missing null check because it traced the data flow, identify a potential race condition because it analyzed the concurrency model, and suggest a more efficient algorithm because it recognized the computational pattern. Teams using Codex for code review see a 60% reduction in review cycle time and a measurable decrease in production incidents traced to review misses.
See AI Code Review in Action →No context switching. No IDE required. Just your terminal and Codex.
The Codex CLI brings the full power of the platform directly into your command-line environment. Generate entire modules, scaffold projects, run automated tests, fix linting errors, and deploy to staging — all through a unified command interface. The CLI maintains session context across commands, so Codex remembers your project structure, coding style, and active task as you work.
Installation takes under thirty seconds. The CLI auto-detects your language runtime, package manager, and framework. It integrates with your existing Git workflow, CI pipeline, and deployment scripts with zero configuration changes. Whether you are prototyping a quick script or orchestrating a multi-service deployment, the Codex CLI gives you a consistent, powerful interface that grows with your needs.
Install the Codex CLI →Codex cut our PR review time from 3 days to 4 hours. The automated first pass catches things our senior engineers would have missed at 11 PM. Our team velocity doubled in the first quarter.— Priya K. Patel, Engineering Lead at Meridian Systems, Austin
I was skeptical about AI code generation until I tried Codex. It generated a fully-tested Express API from a paragraph of requirements — and the code was cleaner than what I would have written myself.— James O. Thornton, Senior Developer at Cascade Analytics, Boston
The CLI integration is seamless. Our CI pipeline now runs Codex code review on every commit. We caught 47 production bugs before they reached staging last month alone.— Dr. Samuel R. Winters, DevOps Architect at Northlight Technologies, Seattle
We onboarded 12 junior developers this year. With Codex providing real-time suggestions and catching common mistakes, they were shipping production code in week two instead of month three.— Elena V. Dragovic, VP Engineering at Apex Fintech, Denver
Codex understands our monorepo better than some of our senior engineers. It suggests cross-module refactors that actually compile. That level of contextual awareness is remarkable.— Tomás A. Reyes, Staff Engineer at Harbor Cloud, Miami
Codex is an AI development platform that analyzes your codebase, understands your intent, and generates production-ready code across 40+ programming languages.
At its core, Codex combines large language models trained on billions of lines of open-source code with a deep understanding of software engineering best practices. When you describe a feature or task — in the web interface, IDE plugin, or CLI — Codex analyzes your project's existing code, dependencies, and conventions. It then generates implementation that fits naturally into your codebase: correct imports, consistent naming, appropriate error handling, and idiomatic patterns for your framework. The platform also provides automated code review, test generation, and deployment automation as integrated capabilities. Codex runs as a cloud service with on-premise deployment options for enterprise customers who require data residency controls.
Installation takes minutes — sign up at codex.gr.com, download the CLI or IDE plugin, and authenticate with your API key.
Getting started with Codex requires three steps. First, create an account at codex.gr.com and choose a plan — there is a free tier for individual developers that includes 500 code generations per month. Second, download the Codex CLI for your operating system or install the IDE plugin for VS Code, JetBrains, or Neovim. The CLI installer auto-detects your environment and configures shell completion. Third, authenticate using the API key from your dashboard. Once authenticated, you can run `codex init` in any project directory to set up project-specific configuration. The platform will index your codebase and begin providing context-aware suggestions immediately. Full onboarding documentation is available in the resource hub.
Codex provides first-class support for over 40 languages including JavaScript, TypeScript, Python, Go, Rust, Java, C#, Ruby, Kotlin, Swift, and PHP, plus all major frameworks.
The platform maintains deep knowledge of language-specific idioms and framework conventions. For JavaScript and TypeScript, Codex understands React, Next.js, Vue, Node.js, and Express patterns. Python support covers Django, FastAPI, Flask, and data science libraries. Go support includes standard library patterns, goroutine best practices, and common framework conventions. Beyond language-specific knowledge, Codex also understands infrastructure-as-code (Terraform, Pulumi), database schemas (SQL, Prisma), and configuration formats (YAML, TOML). The language support matrix is continuously updated — new languages and framework versions are added within weeks of stable releases.
Codex is SOC 2 Type II certified with end-to-end encryption, zero data retention for training, and optional on-premise deployment for regulated industries.
Security is foundational to the Codex architecture. All code transmitted between your environment and Codex servers is encrypted in transit using TLS 1.3. At rest, data is encrypted using AES-256. Codex never uses customer code to train or improve its models — your intellectual property remains yours. For enterprise customers in finance, healthcare, and government, Codex offers on-premise deployment options where the entire platform runs within your VPC or data center. The platform undergoes regular penetration testing by independent security firms, and all findings are published in the security compliance center. Access controls support SAML, OIDC, and SCIM for identity provider integration, with fine-grained role-based permissions for team management.
Codex builds on the foundation of OpenAI Codex technology while adding deep project awareness, team collaboration features, and enterprise-grade deployment options not available in standalone API tools.
While OpenAI Codex demonstrated the potential of AI-assisted programming, the Codex platform extends that vision into a complete development workflow. Key differences include: full-project context awareness (Codex understands your entire codebase, not just the open file), integrated code review automation, team-level analytics and dashboards, CI/CD pipeline integration, and enterprise security controls. Codex also provides a unified experience across web, IDE, and CLI — the tool adapts to how you work rather than forcing a specific interface. The platform includes built-in compliance reporting, audit logging, and role-based access control that standalone AI APIs cannot provide. For teams evaluating AI development tools, the complete platform approach reduces tool sprawl and provides consistent quality across the entire development lifecycle.
Codex offers a free Starter tier for individuals, a Professional plan at $29/month per developer, and custom Enterprise pricing — each tier scales with your needs.
The Starter plan is designed for individual developers and includes 500 code generations per month, basic CLI access, and community support. The Professional plan at $29 per developer per month unlocks unlimited generations, full IDE integration, automated code review, team dashboards, and priority support. Enterprise plans are custom-priced based on team size and feature requirements — they include on-premise deployment, SSO integration, dedicated support, SLA guarantees, and advanced security controls. All paid plans come with a 14-day free trial with no credit card required. Annual billing provides a 20% discount across all tiers. Detailed feature comparison is available on the pricing plans page; reach out to the sales team for an Enterprise quote tailored to your organization's scale.
Codex integrates with GitHub, GitLab, Bitbucket, Slack, Jira, Linear, all major CI/CD platforms, and provides a comprehensive REST API for custom integrations.
Integration is designed to be non-disruptive. The Codex GitHub App installs in seconds and begins reviewing pull requests immediately — no changes to your existing CI configuration required. Slack and Jira integrations push relevant updates to the channels and tickets your team already uses. The REST API and webhook system allow teams to build custom automations: trigger code generation from a design tool, post review results to a custom dashboard, or synchronize Codex configurations across repositories. For teams using monorepo architectures, Codex supports path-based configuration so different services can have independent settings while sharing a single integration. All integrations respect your existing permission model — Codex operates with the access level you grant and never escalates privileges.
Join 250,000+ developers who ship faster, review smarter, and build better with Codex. Start free — no credit card required.
Download Codex FreeWhether you are looking to download Codex for the first time, explore the Codex CLI for terminal-native development, or understand how Codex AI transforms your engineering practice, the platform provides integrated tools for every stage of software delivery. The AI code generation engine produces idiomatic code across 40+ languages, while intelligent code review catches bugs before they reach production. Teams can automate testing with the integrated testing suite, debug efficiently with automated debugging, and enforce quality standards with deep code analysis.
Developers integrating Codex into their toolchain start with CLI installation and IDE plugin setup for their preferred editor. The comprehensive API enables custom automation, CI/CD pipeline integration connects Codex to your deployment workflow, and Docker containerization simplifies environment configuration. The webhook system allows real-time event-driven workflows. For deeper integration, see the full documentation covering every feature in detail. Organizations evaluating the platform can review security certifications, browse pricing options, or contact our team for a personalized walkthrough.