Introducing Codex
📰 OpenAI News
OpenAI introduces Codex, a cloud-based software engineering agent that can work on multiple tasks in parallel, powered by codex-1
Action Steps
- Access Codex through the ChatGPT sidebar
- Assign new coding tasks by typing a prompt and clicking 'Code'
- Ask Codex questions about your codebase by clicking 'Ask'
- Review and iterate on Codex's output
Who Needs to Know This
Software engineers, developers, and product managers can benefit from Codex as it can assist with coding tasks, answer questions, and propose pull requests, increasing productivity and efficiency
Key Insight
💡 Codex is powered by codex-1, a version of OpenAI's o3 model optimized for software engineering, and can generate code that closely mirrors human style and preferences
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🚀 Introducing Codex, a cloud-based software engineering agent that can work on multiple tasks in parallel! 💻
Key Takeaways
OpenAI introduces Codex, a cloud-based software engineering agent that can work on multiple tasks in parallel, powered by codex-1
Full Article
# Introducing Codex | OpenAI
[Skip to main content](https://openai.com/index/introducing-codex#main)
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Introducing Codex | OpenAI
Table of contents
* [How Codex works](https://openai.com/index/introducing-codex#how-codex-works)
* [Building safe and trustworthy agents](https://openai.com/index/introducing-codex#building-safe-and-trustworthy-agents)
* [Aligning to human preferences](https://openai.com/index/introducing-codex#aligning-to-human-preferences)
* [Early use cases](https://openai.com/index/introducing-codex#early-use-cases)
* [Updates to Codex CLI](https://openai.com/index/introducing-codex#updates-to-codex-cli)
* [Codex availability, pricing, and limitations](https://openai.com/index/introducing-codex#codex-availability-pricing-and-limitations)
* [What’s next](https://openai.com/index/introducing-codex#whats-next)
* [Livestream replay](https://openai.com/index/introducing-codex#livestream-replay)
* [Appendix](https://openai.com/index/introducing-codex#appendix)
May 16, 2025
[Release](https://openai.com/research/index/release/)[Product](https://openai.com/news/product-releases/)
# Introducing Codex
A cloud-based software engineering agent that can work on many tasks in parallel, powered by codex-1. Available to ChatGPT Pro, Business, and Enterprise users today, and Plus users soon.
[Try Codex(opens in a new window)](https://chatgpt.com/codex?openaicom-did=4319b8a4-2a71-444b-b510-a354e5e184d0&openaicom_referred=true)
Listen to article
Share
**_Update on June 3, 2025:_**_Codex is now available to ChatGPT Plus users. We’re also enabling users to provide Codex with internet access during task execution. Please refer to the_[_changelog_(opens in a new window)](https://help.openai.com/en/articles/11428266-codex-changelog)_and_[_docs_(opens in a new window)](https://platform.openai.com/docs/codex)_for more details._
* * *
Today we’re launching a research preview of Codex: a cloud-based software engineering agent that can work on many tasks in parallel. Codex can perform tasks for you such as writing features, answering questions about your codebase, fixing bugs, and proposing pull requests for review; each task runs in its own cloud sandbox environment, preloaded with your repository.
Codex is powered by codex-1, a version of OpenAI o3 optimized for software engineering. It was trained using reinforcement learning on real-world coding tasks in a variety of environments to generate code that closely mirrors human style and PR preferences, adheres precisely to instructions, and can iteratively run tests until it receives a passing result. We’re starting to roll out Codex to ChatGPT Pro, Enterprise, and Business users today, with support for Plus and Edu coming soon.
## How Codex works
Today you can access Codex through the sidebar in ChatGPT and assign it new coding tasks by typing a prompt and clicking **“Code”**. If you want to ask Codex a question about your codebase, click **“Ask”**. Each task is processed independently in a separate, isolated environment preloaded with your codebase. Codex can read and edit files, as well as run commands including t
[Skip to main content](https://openai.com/index/introducing-codex#main)
[](https://openai.com/)
* [Research](https://openai.com/research/index/)
* Products
* [Business](https://openai.com/business/)
* [Developers](https://openai.com/api/)
* [Company](https://openai.com/about/)
* [Foundation(opens in a new window)](https://openaifoundation.org/)
[Try ChatGPT(opens in a new window)](https://chatgpt.com/?openaicom-did=4319b8a4-2a71-444b-b510-a354e5e184d0&openaicom_referred=true)
* Research
* Products
* Business
* Developers
* Company
* [Foundation(opens in a new window)](https://openaifoundation.org/)
Introducing Codex | OpenAI
Table of contents
* [How Codex works](https://openai.com/index/introducing-codex#how-codex-works)
* [Building safe and trustworthy agents](https://openai.com/index/introducing-codex#building-safe-and-trustworthy-agents)
* [Aligning to human preferences](https://openai.com/index/introducing-codex#aligning-to-human-preferences)
* [Early use cases](https://openai.com/index/introducing-codex#early-use-cases)
* [Updates to Codex CLI](https://openai.com/index/introducing-codex#updates-to-codex-cli)
* [Codex availability, pricing, and limitations](https://openai.com/index/introducing-codex#codex-availability-pricing-and-limitations)
* [What’s next](https://openai.com/index/introducing-codex#whats-next)
* [Livestream replay](https://openai.com/index/introducing-codex#livestream-replay)
* [Appendix](https://openai.com/index/introducing-codex#appendix)
May 16, 2025
[Release](https://openai.com/research/index/release/)[Product](https://openai.com/news/product-releases/)
# Introducing Codex
A cloud-based software engineering agent that can work on many tasks in parallel, powered by codex-1. Available to ChatGPT Pro, Business, and Enterprise users today, and Plus users soon.
[Try Codex(opens in a new window)](https://chatgpt.com/codex?openaicom-did=4319b8a4-2a71-444b-b510-a354e5e184d0&openaicom_referred=true)
Listen to article
Share
**_Update on June 3, 2025:_**_Codex is now available to ChatGPT Plus users. We’re also enabling users to provide Codex with internet access during task execution. Please refer to the_[_changelog_(opens in a new window)](https://help.openai.com/en/articles/11428266-codex-changelog)_and_[_docs_(opens in a new window)](https://platform.openai.com/docs/codex)_for more details._
* * *
Today we’re launching a research preview of Codex: a cloud-based software engineering agent that can work on many tasks in parallel. Codex can perform tasks for you such as writing features, answering questions about your codebase, fixing bugs, and proposing pull requests for review; each task runs in its own cloud sandbox environment, preloaded with your repository.
Codex is powered by codex-1, a version of OpenAI o3 optimized for software engineering. It was trained using reinforcement learning on real-world coding tasks in a variety of environments to generate code that closely mirrors human style and PR preferences, adheres precisely to instructions, and can iteratively run tests until it receives a passing result. We’re starting to roll out Codex to ChatGPT Pro, Enterprise, and Business users today, with support for Plus and Edu coming soon.
## How Codex works
Today you can access Codex through the sidebar in ChatGPT and assign it new coding tasks by typing a prompt and clicking **“Code”**. If you want to ask Codex a question about your codebase, click **“Ask”**. Each task is processed independently in a separate, isolated environment preloaded with your codebase. Codex can read and edit files, as well as run commands including t
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