AI software development platform with desktop, CLI, and cloud agents for coding tasks and reviewable changes.
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Coding & DevelopmentAI Agents & Workflows
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Free plan + paidInformation reviewed 2026-10-15
OpenAI Codex
About this listing
Product and access model reviewed from current official sources; workflow and example are editorial suggestions, not a hands-on test.
Official sourceOpenAI coding agent for cloud tasks, CLI, IDE extension and SDK, included in ChatGPT plans from Free to Enterprise.
Best suited to
OpenAI Codex suits developers who want to delegate coding tasks to a cloud or local agent and review the result as a pull request.
Meet OpenAI Codex
OpenAI Codex suits developers who want to delegate coding tasks to a cloud or local agent and review the result as a pull request. It runs in the CLI, an IDE extension, the ChatGPT apps and an SDK for scripted work. Start with small, well-tested tasks so you can judge the quality of its changes.
A practical workflow
- Choose a repository with working tests
- Hand Codex one small task and read its plan
- Review the proposed change and run the tests
- Add instructions in an AGENTS.md file once the pattern works
Illustrative input
This example describes a task, not a tested output. Adjust the source material and settings to your own situation.
Add input validation to the signup form handler, update the unit tests and open a pull request with a short summary.
Result check: Check the pull request diff, run the tests locally and confirm the validation matches your rules.
Access and alternatives
Codex is available on ChatGPT Free, Go, Plus, Pro, Business, Edu and Enterprise plans, with usage shared with ChatGPT. API-key access is billed at standard API pricing. Some features, such as computer use, are regionally limited on some plans, so check what your plan includes.
Choose another workflow when its emphasis fits better: Cursor for an AI-first code editor; GitHub Copilot for suggestions inside GitHub and your editor; Devin for a fully autonomous software agent.
What you can do
Local and cloud task execution
Sandboxing and permission controls
GitHub pull request reviews
Skills, plugins and MCP servers
Subagents and scheduled tasks
Slack and Linear integrations
Where it helps
- Several ways to run it: cloud, CLI, IDE and SDK
- Available on a free ChatGPT plan with limits
- Review and delegation features for GitHub
What to consider
- Usage limits depend on plan and shared with ChatGPT
- Some features are region or plan limited
Pricing & free access
Official pricingFree plan + paid
Codex is available on ChatGPT Free, Go, Plus, Pro, Business, Edu and Enterprise plans, with usage shared with ChatGPT. API-key access is billed at standard API pricing. Some features, such as computer use, are regionally limited on some plans, so check what your plan includes.
Plan information can change. Prices and conditions are set by the provider. Information checked 2026-10-15.
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Questions about OpenAI Codex
Who is OpenAI Codex useful for?
OpenAI Codex suits developers who want to delegate coding tasks to a cloud or local agent and review the result as a pull request. It runs in the CLI, an IDE extension, the ChatGPT apps and an SDK for scripted work. Start with small, well-tested tasks so you can judge the quality of its changes.
Does OpenAI Codex have continuing free access?
Codex is available on ChatGPT Free, Go, Plus, Pro, Business, Edu and Enterprise plans, with usage shared with ChatGPT. API-key access is billed at standard API pricing. Some features, such as computer use, are regionally limited on some plans, so check what your plan includes.
How should I start a small evaluation?
Choose a repository with working tests Hand Codex one small task and read its plan
What should I check in the result?
Check the pull request diff, run the tests locally and confirm the validation matches your rules.
When should I choose a different workflow?
Cursor for an AI-first code editor; GitHub Copilot for suggestions inside GitHub and your editor; Devin for a fully autonomous software agent.
Did this help you complete your task?
Tell us what needs improving. No account or private output required.
Report incorrect information or a broken linkReview evidence
Documentation-based review · 2026-10-15
Reviewed from the linked official documentation. The workflow and example are editorial suggestions; no account-level product test or measured performance comparison was performed.
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