Codex

Featured

Code & Development

OpenAI

Paid

About

OpenAI's AI coding agent desktop app (macOS), supporting multi-agent parallel collaboration, code generation, PR management, code review, also available as CLI

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Key Features

Autonomous AI coding agent powered by GPT-5-Codex

Multi-file code editing and generation across entire repository

Isolated sandbox environment for safe code execution and testing

Open-source Codex CLI for terminal-native workflow

Automated pull request generation with test validation

Parallel task execution — run multiple agents simultaneously

VS Code and JetBrains IDE integration

70%+ on SWE-bench Verified benchmark

Pricing

free

Limited Codex access via ChatGPT Free

plus

$20/month via ChatGPT Plus

pro

$200/month via ChatGPT Pro (max tasks)

team

$25/user/month via ChatGPT Team

Use Cases

Bug fixing with failing test verification

Feature development from specification

Code migration and dependency upgrades

Test coverage writing

Code review and refactoring

Technical debt reduction

Pros

Truly autonomous — delegates end-to-end tasks

Parallel execution: run multiple agents at once

Sandboxed execution with test validation built-in

Works across ChatGPT, CLI, and IDEs

Open-source CLI for custom workflows

Seamless integration with ChatGPT ecosystem

Cons

Expensive at Pro tier ($200/month) for heavy users

Requires clear specifications and good test coverage

~1 in 5 PRs needs meaningful human correction

Not ideal for exploratory or ambiguous tasks

No free standalone tier (requires ChatGPT subscription)

Limited to coding tasks only

Latest Update

2026.07: OpenAI Codex runs on GPT-5-Codex model, scores 70%+ on SWE-bench Verified. Available across ChatGPT Plus ($20/mo), Pro ($200/mo), Team, and Enterprise tiers. Codex CLI is open source for terminal-native workflows. Parallel agent execution supports multiple simultaneous coding tasks.