OpenAI's flagship agentic coding platform combining Codex Web (autonomous cloud agent powered by o3) and Codex CLI (open-source local tool using GPT-5), delivering end-to-end software development with PR automation and multimodal input support.
Watch Codex analyze the codebase, identify the root cause, and implement a fix autonomously in its cloud sandbox.
💡 This is a simulated example demonstrating typical OpenAI Codex capabilities. No actual LLM call is made.
| Core Competency | Autonomous Development, PR Automation, ChatGPT Ecosystem, Multimodal Coding, Enterprise Teams |
|---|---|
| AI Architecture | Codex Web uses specialized o3 optimized for coding. Codex CLI uses GPT-5 by default with support for GPT-5.1-Codex-Mini for extended local usage. |
| Context Window | Large context via o3/GPT-5. Repository preloading enables full codebase understanding without manual file selection. |
| Deployment | Enterprise Cloud with SSO/SCIM |
| Offline Support | Codex CLI supports local execution. Codex Web requires internet for cloud sandbox operation. |
| IDE Integration | IDE-agnostic via CLI. Integrates with GitHub for PR workflows. ChatGPT desktop and web interfaces. |
| Company Maturity | 11 years - Unicorn status |
| Pricing Model | Enterprise Premium - High-growth pricing |
Visual breakdown of this tool's performance across six key evaluation criteria
See how OpenAI Codex ranks against the top AI coding assistants in our directory
OpenAI Codex has emerged as a legitimate Claude Code challenger, with GPT-5.2-Codex achieving 80.0% on SWE-bench Verified—nearly matching Claude Opus 4.5's record 80.9%. Where Codex shines is efficiency: it's 3x more token-efficient than Claude, meaning faster task completion at lower cost. The 2026 relaunch introduced two complementary components: Codex Web (cloud sandbox with o3) and Codex CLI (local GPT-5). At just $20/month with ChatGPT Plus, it offers the best value proposition among top-tier agentic tools. The auto-PR review feature is exceptional—understanding intent and running code for semantic analysis beyond static tools. While Claude Code edges ahead on raw accuracy, Codex's efficiency advantage and OpenAI ecosystem integration make it the top choice for teams prioritizing speed and cost.
OpenAI Codex stands as a flagship AI development platform with substantial institutional backing and cutting-edge capabilities. Microsoft backing ensures deep integration with enterprise development ecosystems. Best suited for developers requiring advanced AI assistance in their primary development workflow.
**Enterprise development teams and well-funded startups** that require cutting-edge AI capabilities and can invest in premium tools.
Status: Private (capped-profit)
Founded: 2015
Backing: Over $13 billion from Microsoft, plus investments from Thrive Capital, a]16z, and others. Valued at $150B+ as of late 2025.
OpenAI Codex offers paid plans starting at $20/month. The ChatGPT Plus plan includes 30-150 Codex messages per 5 hours and Codex Web cloud sandbox.
Codex Web uses specialized o3 optimized for coding. Codex CLI uses GPT-5 by default with support for GPT-5.1-Codex-Mini for extended local usage.
OpenAI Codex supports IDE-agnostic via CLI. Integrates with GitHub for PR workflows. ChatGPT desktop and web interfaces..
Yes, OpenAI Codex supports offline mode. Codex CLI supports local execution. Codex Web requires internet for cloud sandbox operation.
OpenAI Codex scores 96/100 versus Claude Code's 98/100. OpenAI Codex excels at Autonomous Development and PR Automation, while Claude Code is known for Agentic Coding and Complex Refactoring.
OpenAI Codex is best suited for Autonomous Development, PR Automation, ChatGPT Ecosystem, Multimodal Coding, Enterprise Teams. Autonomous feature implementation: describe the task, Codex works independently in a cloud sandbox f
Large context via o3/GPT-5. Repository preloading enables full codebase understanding without manual file selection.
Primary references: blog, docs, release notes, API, and status pages.
| Plan | Price | Features |
|---|---|---|
| ChatGPT Plus | $20 /month |
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| ChatGPT Pro | $200 /month |
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| Business/Enterprise | Custom |
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Pricing information last verified: February 2026. Visit official pricing page for current rates.
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