Codex

OpenAI's cloud-based software engineering agent for parallel task execution across your codebase

Included in ChatGPT Plus $20/mo and Pro $200/mo; API via codex-mini from $1.50/M tokens

Overview

Codex is OpenAI's cloud-based software engineering agent that operates in a sandboxed environment to complete coding tasks from natural language instructions. It can run tests, fix bugs, write features, and navigate entire codebases — all without any local setup — making it a powerful tool for both simple scripts and complex engineering projects.

Key Features

Cloud-based agent that runs in an isolated sandbox — no local environment needed
Reads, edits, and creates files across a full codebase
Runs shell commands, tests, and build scripts to verify its work
Works from GitHub repository context for existing projects
Handles parallel tasks across multiple coding jobs simultaneously
Powers the coding capabilities in ChatGPT and the OpenAI API

Pricing: Accessible via ChatGPT Plus/Pro; API pricing based on token usage.

Pros

Runs multiple tasks in parallel in isolated cloud sandboxes
Works directly with GitHub repos and proposes pull requests
Powered by codex-1 (o3 optimized for software engineering)
Available via ChatGPT, dedicated app, CLI, and IDE extensions

Cons

Internet access disabled by default during task execution
Requires ChatGPT Plus or Pro subscription for ChatGPT access
Best for well-scoped tasks; less suited to open-ended exploration
AI-generated code should always be reviewed before deploying

Product Updates

OpenAI@OpenAI

Just gonna leave this here. https://t.co/EOI980j9e9

5.5KMay 8, 2026View on X ↗

OpenAI@OpenAI

MRC is already deployed across all of OpenAI’s largest supercomputers that we use to train frontier models, including our site with @Oracle Cloud Infrastructure (OCI) in Abilene, Texas, and in @Microsoft’s Fairwater supercomputers. MRC is now available through the

926May 6, 2026View on X ↗

OpenAI@OpenAI

We’ve partnered with @AMD, @Broadcom, @Intel, @Microsoft, and @NVIDIA, to release Multipath Reliable Connection (MRC), a new open networking protocol that helps large AI training clusters run faster and more reliably, with less wasted GPU time.

6.1KMay 6, 2026View on X ↗

OpenAI@OpenAI

One week since the launch of GPT-5.5, and it’s already our strongest model launch yet. API revenue is growing more than 2x faster than any prior release, while Codex doubled revenue in under seven days as enterprise demand for agentic coding tools keeps climbing.

8.8KMay 1, 2026View on X ↗

OpenAI@OpenAI

Now available for ChatGPT accounts: Advanced Account Security, a new opt-in setting for people at higher risk of digital attacks, with stronger protections including phishing-resistant sign-in and more secure account recovery.

2.4KApr 30, 2026View on X ↗

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Codex

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