Codex

Codex is OpenAI's coding agent that can read, edit, and run code across CLI, IDE extension, web/cloud tasks, and API-key automation. It is strongest when you can give it a bounded repository task, a verification command, and a review loop, then let it return a branch or diff rather than a loose code snippet.

• Works across web/cloud tasks, CLI, IDE extension, and API-key automation.
• Cloud tasks can run in the background, including parallel tasks, and can connect to GitHub repositories.
• Plus includes Codex on web, CLI, IDE extension, and iOS, while API-key use supports CLI, SDK, and IDE automation.
• Where it fits: OpenAI's coding agent for multi-agent software work across desktop and mobile apps, IDE extension, CLI, remote SSH environments, cloud tasks, skills, hooks, scheduled automations, and new role-specific plugins, annotations, and shared Sites.

• Code completion and generation: Codex applies this capability to Coding agent, Multi-agent workflows so users can move faster while keeping output quality reviewable.
• Repository-aware chat and explanations: Codex applies this capability to Coding agent, Multi-agent workflows so users can move faster while keeping output quality reviewable.
• Debugging, refactoring, and test creation: Codex applies this capability to Coding agent, Multi-agent workflows so users can move faster while keeping output quality reviewable.
• App prototyping and deployment workflows: Codex applies this capability to Coding agent, Multi-agent workflows so users can move faster while keeping output quality reviewable.
• Developer documentation and review support: Codex applies this capability to Coding agent, Multi-agent workflows so users can move faster while keeping output quality reviewable.

• Open the official website or install the supported editor, CLI, or browser workspace. Keep a human review step in the workflow for facts, privacy, rights, and brand fit.
• Connect the repository or create a new coding project. Keep a human review step in the workflow for facts, privacy, rights, and brand fit.
• Describe the change, bug, feature, or file context clearly. Keep a human review step in the workflow for facts, privacy, rights, and brand fit.
• Review generated code, run tests, and inspect diffs before accepting changes. Keep a human review step in the workflow for facts, privacy, rights, and brand fit.
• Commit, deploy, or continue iterating through the development workflow. Keep a human review step in the workflow for facts, privacy, rights, and brand fit.

• Codex offers a free tier or trial, so you can evaluate it before upgrading.
• Paid plans for Codex start at about $0 Free / $20/mo Plus, with higher tiers unlocking more usage, stronger models, and team features.
• Included in ChatGPT Free, Go ($8/mo), Plus ($20/mo), Pro (from $100/mo), Business, Edu, and Enterprise. Plus includes Codex on web, CLI, IDE extension, and iOS; API-key usage pays only for the tokens Codex uses and does not include cloud-based features.
• Pricing last checked 2026-06-22, source: https://developers.openai.com/codex/pricing. Plans can change, so confirm on the official site.

• Feature implementation and rapid prototyping. Codex can shorten preparation time, create first drafts, or help teams compare options faster.
• Codebase exploration and onboarding. Codex can shorten preparation time, create first drafts, or help teams compare options faster.
• Bug fixing, refactoring, and test generation. Codex can shorten preparation time, create first drafts, or help teams compare options faster.
• Documentation, API examples, and migration work. Codex can shorten preparation time, create first drafts, or help teams compare options faster.
• Full-stack app scaffolding and deployment experiments. Codex can shorten preparation time, create first drafts, or help teams compare options faster.

• Software engineers and engineering teams. If Coding agent, Multi-agent tasks appear often in your work, Codex can become part of a repeatable productivity workflow.
• Indie hackers and startup builders. If Coding agent, Multi-agent tasks appear often in your work, Codex can become part of a repeatable productivity workflow.
• Product engineers and technical founders. If Coding agent, Multi-agent tasks appear often in your work, Codex can become part of a repeatable productivity workflow.
• QA, DevOps, and platform teams. If Coding agent, Multi-agent tasks appear often in your work, Codex can become part of a repeatable productivity workflow.
• Learners who want guided coding practice. If Coding agent, Multi-agent tasks appear often in your work, Codex can become part of a repeatable productivity workflow.